300 PRC update

surgeon260

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Hornady brass has been horrible for as long as I have been reloading. It is the very definition of a long term issue. I can't take the 300 PRC (or 6.5 PRC, or 375 Ruger, or any other Hornady cartridge) seriously until someone else makes brass.
 
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Sdvldog1371

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74.0-74.5 gr of RL-26 at SAAMI COAL with a 225 has done very well in all of the 4-5 300 PRC's I've seen in the wild.
That's great...if you can find Reloder 26. I have been looking since before I had GA precision build my 300 PRC...over a year and a half and I found 1lb a couple weeks ago, now I'm holding onto it lol. I'm afraid to open it at this point until I can find at least 1 more pound.
 

Ledzep

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Define "horrible". It's been more consistent than Remington, on par or better than Winchester, almost the same as Nosler, but softer (I honestly wasn't impressed with Nosler for the price-- only tried it once in .243ai), hands down better than S&B, PPU, LC etc...

Alpha, Lapua, Norma, and a handful of others are more consistent and tougher in the head, but also cost 20-100+% more depending on caliber.

If you sort by lot (I often take this as a given, but maybe I shouldn't assume everyone does it) I've had no problem keeping SD's below 12fps, and if you keep load data within SAAMI specs (Where most people have issues I think) I've never had a problem getting 10+ loads out of a case. Not saying it's perfect-- the heads are softer than many (most?), but if you keep it within SAAMI pressure (max book loads) everything plays much nicer.
 

Dippy

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Hornady brass has been horrible for as long as I have been reloading. It is the very definition of a long term issue. I can't take the 300 PRC (or 6.5 PRC, or 375 Ruger, or any other Hornady cartridge) seriously until someone else makes brass.

Hornady brass isn’t that bad, just tend it before you send it!

I was at the range on Sunday and guys were talking about chambering the 300 PRC on their next barrel. It’s getting popular and the gov started using it. The brass will come.

if you keep the loads within Sammi psi Hornady brass is just fine. Once you exceed these pressures then your exceeding the design of the brass. Besides it’s also way cheaper then some of the other brands and will shoot just as good.
 

Evolved Ballistics

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So I wanted to add to the conversation here...I just got done with load development with my 300 PRC, I am shooting Warner Flatline 198's at 3123 with no pressure at all. I am using 85 grains of N570 and have an ES of 9...so far it is looking pretty good, group is about a 1/3 MOA which is fine...bullets won't feed, but this is for fun. I will probably develop another load with a jacketed that does. The Hornady brass only showed slight pressure signs at 86 grains, so far it is doing good. The bullets have an OAL of 4.018 and we had to use a 30 Nosler die to seat them because the ELDM seating die for the 300 prc was too short for the Flatline. I will take them out to distance soon and see what kind of results I get, on paper I should be supersonic to about 1800.
 

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Coltonlrs

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Has anyone used N560
Well guys with n560 I started to see pressure at 73grs with 225gr eld m bullets but here’s a group with a load that I came up with with 72.2 grs the group that has a vertical string was shot at 200 yards
 

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Coltonlrs

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So I wanted to add to the conversation here...I just got done with load development with my 300 PRC, I am shooting Warner Flatline 198's at 3123 with no pressure at all. I am using 85 grains of N570 and have an ES of 9...so far it is looking pretty good, group is about a 1/3 MOA which is fine...bullets won't feed, but this is for fun. I will probably develop another load with a jacketed that does. The Hornady brass only showed slight pressure signs at 86 grains, so far it is doing good. The bullets have an OAL of 4.018 and we had to use a 30 Nosler die to seat them because the ELDM seating die for the 300 prc was too short for the Flatline. I will take them out to distance soon and see what kind of results I get, on paper I should be supersonic to about 1800.
What twist rate is your barrel
 

browning442

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Suppressor question here.... anyone used one rated for 300 win mag on their 300 PRC?

The SAAMI 300 win mag pressure is listed for 64,000 max, whereas the PRC is 65,000 max.

My suppressor is a SIG SRD762 QD.... their website says its rated up to 64,000 psi/300 win mag, or anything of same case size and pressure. So I guess I'm not sure whether to chance it or not.

Thanks
 

Ledzep

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Yeah I use my SRT Arms .30 XL Ti can on my 300 prc all the time. The 1000psi at the chamber won't equate to much by the time the bullet gets to the muzzle. You can fairly typically see 2000-5000 psi changes from shot to shot with factory ammo. Most of them are rated for a certain cartridge at a certain barrel length (10.5, 12.5, 14.5, 16" are common minimum lengths). By the time a bullet gets down 24-30" of barrel the pressure has dropped off considerably.. Like 10,000-20,000psi.

At any rate, I'd consider the 300wm and 300 PRC pretty much equivalent for that application.
 

b2lee

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Dear Diary,

Today my MDT ACC chassis arrived. After viewing it with a lusty eye, I put the buttstock and the adjustable grip on and decided to gently insert the Defiant Deviant Tactical/flutted 28" Bartlein 1-9/APA lil'B with a Trigger Tech Diamond into the inviting welcoming channel. Snugging up the action screws was quick but hot and satisfyingly naughty.

She was born in the pristine halls of Southern Precision Rifles. This 300PRC is sexy...but still missing the Atlas Bipod, and the Spuhr 9mil 34mm mount that will hold the Vortex Razor GenII 4.5-27 EBR-7C MRAD that is just waiting to hop on top of all that goodness.

I can't wait to run that sweet as butter bolt and lightly tickle the wanton trigger. Alas...this girl is heavy...but I don't care. Heavy guns need love too.

Wednesday may be the day I let her scream across the Kentucky fields and slam hot lead into singing steel.

Pics...as soon as my phone stops being a butt and takes a pic that doesn't look 1990's bad lighting and drunk behind the lens.
 

b2lee

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Shot 20 rounds today of Hornady Match with the 225 ELD-M. I'm in awe and in love at the same time. There were 4 of us at the local range today. My first shot after bore sighting was a little high at 50 yards and the next was dead on. However, it was funny because it blew my buddies hat off his head with the lil'B muzzle brake...he was sitting slightly behind and 5 feet to the left. The lil'B was like fire and furry....like a woman scorned. All thump and noise...but they looked at me and wondered why my face was smiling from ear to friggin ear.

Simple, the recoil on this 28" Bartlein heavy varmint, 1-9, spiral fluted, blended lil'B brake....with a Deviant Tact....all nicely tucked into a MDT ACC chassis that I sat on my living room floor and adjusted everything to my liking.....well...it kicked like a 5.56 AR. ALL that noise and it kicked like a little girl. I could sit behind this thing all day. The MDT ACC set to my liking...to my body...had a straight recoil with no muzzle jump....I could see the target from before, trigger pull, recoil, and through the entire bolt cycle.

Yea...I think I can live with that. I was only able to shoot out to 242 yards today. Basically I was breaking in the barrel today. It is going to shoot lights out. I borrowed a chrono for a few shots and it was 2907, 2900, 2984, 2909 and 2984. Tonight, I'm processing my brass, reloading and I'll go tomorrow with some 230gr A-Tips with Retumbo...yea...nobody has RL-26 right now. I will do a little load development and see what the speeds are on the Retumbo.
 

waveslayer

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Shot 20 rounds today of Hornady Match with the 225 ELD-M. I'm in awe and in love at the same time. There were 4 of us at the local range today. My first shot after bore sighting was a little high at 50 yards and the next was dead on. However, it was funny because it blew my buddies hat off his head with the lil'B muzzle brake...he was sitting slightly behind and 5 feet to the left. The lil'B was like fire and furry....like a woman scorned. All thump and noise...but they looked at me and wondered why my face was smiling from ear to friggin ear.

Simple, the recoil on this 28" Bartlein heavy varmint, 1-9, spiral fluted, blended lil'B brake....with a Deviant Tact....all nicely tucked into a MDT ACC chassis that I sat on my living room floor and adjusted everything to my liking.....well...it kicked like a 5.56 AR. ALL that noise and it kicked like a little girl. I could sit behind this thing all day. The MDT ACC set to my liking...to my body...had a straight recoil with no muzzle jump....I could see the target from before, trigger pull, recoil, and through the entire bolt cycle.

Yea...I think I can live with that. I was only able to shoot out to 242 yards today. Basically I was breaking in the barrel today. It is going to shoot lights out. I borrowed a chrono for a few shots and it was 2907, 2900, 2984, 2909 and 2984. Tonight, I'm processing my brass, reloading and I'll go tomorrow with some 230gr A-Tips with Retumbo...yea...nobody has RL-26 right now. I will do a little load development and see what the speeds are on the Retumbo.
I'm working up a load with the 230 gAy Tips with H1000.. 74.5-74.8gr. Let us know about Retumbo
 
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Dippy

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Shot 20 rounds today of Hornady Match with the 225 ELD-M. I'm in awe and in love at the same time. There were 4 of us at the local range today. My first shot after bore sighting was a little high at 50 yards and the next was dead on. However, it was funny because it blew my buddies hat off his head with the lil'B muzzle brake...he was sitting slightly behind and 5 feet to the left. The lil'B was like fire and furry....like a woman scorned.
Reminds me of a time I was set up prone and a guy maybe 10’ to my left set up. Me 300 win mag him 338 Lapua mag, both with 5 port brakes. Some guy with a 556 AR decides he’s going to set up in between us and shoot prone. He was covered in dirt after that session
 

Sdvldog1371

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8 lb Keg of H1000 and 1000 BR-2 primers arrived just now. I'm thinking I may need to buy at least 1 more box of 225 ELD-m ammo and give them another try. My rifle wouldn't group 2 moa initially, but I got my bergara stock inlet for the badger bottom metal. Then I went and redid my h1000 load development and bam, sub 1/2 MOA, reshot the sub 1/2 load on 2 more occasions to verify and it looks solid. I'm thinking the original stock I was running was my inaccuracy issue and I may get similar results with box ammo. I have culled about 20 cases from the original 200 anyway so it couldn't hurt to bring the number back up.
 

Steel head

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Reminds me of a time I was set up prone and a guy maybe 10’ to my left set up. Me 300 win mag him 338 Lapua mag, both with 5 port brakes. Some guy with a 556 AR decides he’s going to set up in between us and shoot prone. He was covered in dirt after that session
And on that day Culpepper developed his hate for brakes.
 

Sdvldog1371

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Simple, the recoil on this 28" Bartlein heavy varmint, 1-9, spiral fluted, blended lil'B brake....with a Deviant Tact....all nicely tucked into a MDT ACC chassis that I sat on my living room floor and adjusted everything to my liking.....well...it kicked like a 5.56 AR. ALL that noise and it kicked like a little girl.
[/QUOTE]

I know what you mean, I have a precision armament m4-72 brake on a 24" proof carbon sendero and my magneto speed has my 212 eldx loads clocked at 2927-2939 fps. Barks and throws crap everywhere like a confetti cannon eruption but kicks like my 260 with a 26" Krieger m24 contour and DE brake. Not sure how this brake as gives as much reduction as it does but I can literally fire 120 rds in a session without feeling worn out or physically battered. Brake off....I did 80 and I was a hurting unit.
 

wspe1

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Shot 20 rounds today of Hornady Match with the 225 ELD-M. I'm in awe and in love at the same time. There were 4 of us at the local range today. My first shot after bore sighting was a little high at 50 yards and the next was dead on. However, it was funny because it blew my buddies hat off his head with the lil'B muzzle brake...he was sitting slightly behind and 5 feet to the left. The lil'B was like fire and furry....like a woman scorned. All thump and noise...but they looked at me and wondered why my face was smiling from ear to friggin ear.

Simple, the recoil on this 28" Bartlein heavy varmint, 1-9, spiral fluted, blended lil'B brake....with a Deviant Tact....all nicely tucked into a MDT ACC chassis that I sat on my living room floor and adjusted everything to my liking.....well...it kicked like a 5.56 AR. ALL that noise and it kicked like a little girl. I could sit behind this thing all day. The MDT ACC set to my liking...to my body...had a straight recoil with no muzzle jump....I could see the target from before, trigger pull, recoil, and through the entire bolt cycle.

Yea...I think I can live with that. I was only able to shoot out to 242 yards today. Basically I was breaking in the barrel today. It is going to shoot lights out. I borrowed a chrono for a few shots and it was 2907, 2900, 2984, 2909 and 2984. Tonight, I'm processing my brass, reloading and I'll go tomorrow with some 230gr A-Tips with Retumbo...yea...nobody has RL-26 right now. I will do a little load development and see what the speeds are on the Retumbo.
Out of curiosity, why did you go with the lil b brake and not the Fat b?
 

b2lee

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So, I got 20 rounds loaded with 230gr A Tips and Retumbo....1 at 68.3gr...1 at 70gr....1 at 71.5gr...1 at 73gr...5 at 75gr....5 at 78gr....5 at 78.5gr...and 1 at a charge I won't publish.

Probably will have troubles falling asleep tonight.
 

b2lee

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Out of curiosity, why did you go with the lil b brake and not the Fat b?
hmmm...good question....most probably because it is a case of go with what you know and have used already.....or I like the target crown look of the lil'b versus the butt plug look of the Fat B. I don't think I put much thought into a choice between them....I was thinking 419...but I went with what I already knew on that choice.

Also, Greg at SPR blended the lil'B to the barrel and it looks like one piece:

 
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b2lee

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Ok...load development update...with a SERIOUS caveat. First, since I'm now poor after this purchase I don't actually have a scope that is valid for this setup....so....after the first monkey spank group I heard a metal on metal clanking and I broke the borrowed scope. So the other 2 5shot groups opened way up and you can't invalidate them as accurate...because the scope went to crap.

Details:

Cartridge: 300 PRC
Bullet: Hornady 230gr A-Tip
Brass: Hornady once fired....shot yesterday
Primer: Federal Gold Match Large
Powder: Hodgden Retumbo
Barrel: 28" Bartlein 1-9 Twist with a Lil'B brake, Heavy Varmint, spiral flute.
Action: Defiance Deviant Tactical, Fluted, 6mil rail
Trigger: TriggerTech Diamond - set to 6 ounces
Scope: (laugh) Vortex Crossfire (/stop laughing)

Distance: 100 yards
Temp: 80F
Wind: 10mph from 10o'clock - Steady
Mirage: Negligible
Elevation: 910ft
Shot angle: Even ground...very flat
Shooting position: Very steady benchtable with solid seat, front rest and rear small bag.

Reference following loads with pic of target below

Ammo:

1. Factory 225gr ELD-M - reference load

-----Start of 230gr A-Tips with Retumbo-----
2. 68.5gr - shot way low, audibly softer, recoil softer, felt like a wimp load

3. 70.0gr - came up near the factory load with similar audible and recoil.
4. 71.5gr - basically same damn hole. Audible and recoil weren't discernible from #3
5. 73.0gr - basically same dman hole. Audible and recoil weren't discernible from #3 or #4

These three different powder loads shot a 3 shot group under a 1/4MOA...to me..that is a nice node

Reloaded in blocks of 5 for the next groups

6-10. 75.0gr Group - Shift the windage to pull the group left of the other group. Measued .473 with a dial mic. Target is .018 thick cardboard and flaked around the holes...hard to measure. For a gun with less than 30 rounds to this point....this group made me think naughty thoughts.

11-15. 78.0gr group - Again, shifted windage to pull the group away from the previous.
First shot I heard a metal on metal clang...didn't know what it was.
Second shot went way low and then the adjuster ring for the parallax slid down the tube toward the elevation knob.
Third shot I noticed an artifact in the lens.
Fourth Shot I noticed something like extra scope shadow in the bottom left.
Fifth shot didn't seem to get any worse

This group can't be covered by a Quarter...It isn't the loads fault...I'll be able to buy the Razor GenII in a few weeks and revist this load again.

16-20. 78.5gr Group - Same issues with the previous group and about the same results. I shifted everything left again to pull the group out of the path of the other group. I'll revist this load when I get the new scope.

21. 80.0gr - OVER SPECS - Shift windage back to original wind zero and it shot high. Audible and recoil were very noticeable but brass appeared fine. When I de-prime I'll take notice of any primer pocket issues...and when I reprime, I'll see if it is loose or is noticeably easier to insert.

 

b2lee

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Continuing on from the above post. You'll most likely be asking about speeds.

1. Retail Hornady 225-ELD-M - 2909

Retumbo and 230gr A-Tips

2. 68.5gr - 2701

3. 70.0gr - 2817
4. 71.5gr - 2825
5. 73.0gr - 2849

6. 75.0gr - averaged 2884

7. 78.0gr - averaged 2925

8. 78.5gr - averaged 2947

9. 80.gr - said 3041...but only shot one.

As always....every chrono will measure differently...on different days....in different conditions....so take those speeds with a grain of salt I guess. Next week should be some H1000 load development with hopefully a new scope.

And...does anyone know where the hell I can get some RL-26?
 
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Rocketmandb

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For anyone who is interested, I've redone my fire forming videos and reposted them on YouTube - I lengthened them, and added a disclaimer up front (lawyers... my wife is one). By slowing them down and adding some new commentary, I think they are easier to follow and better depict how easy fire forming 8x68S brass is for the 300 PRC.


 

Ledzep

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Question "A" is a for sure, No. Not with a hand press. Web area on those cases is probably .080" thick give or take, and not like a neck, which gets 1 or 2 more annealing cycles in the manufacturing process. Bigger diameter, thicker, harder. You'll probably break the handle on your press, and if you don't you'll for sure kill the rim when you try to pull it out of the die.
 

LakuNoc

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Looking for Proof research Carbon Fiber Barrel. Chambered in 300 PRC savage small shank for Mausingfield action. 5/8x24 thread for brake, not sure if anywhere in stock?
Thank You
 

Rocketmandb

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Question "A" is a for sure, No. Not with a hand press. Web area on those cases is probably .080" thick give or take, and not like a neck, which gets 1 or 2 more annealing cycles in the manufacturing process. Bigger diameter, thicker, harder. You'll probably break the handle on your press, and if you don't you'll for sure kill the rim when you try to pull it out of the die.
Wholeheartedly agree - and no need with 8x68S being a good match anyway.
 

j741

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Looking for Proof research Carbon Fiber Barrel. Chambered in 300 PRC savage small shank for Mausingfield action. 5/8x24 thread for brake, not sure if anywhere in stock?
Thank You
Call Paul Butler @ Evolved Ballistics - 210-872-7790. They're running a 10% off proof barrels this weekend. I've bought the barrel you're looking for (also for my Mausingfield) as well as a Proof AXMC steel prefit from him, prices & service are great. It's likely not in stock anywhere and will take up to 2 months to arrive.
 
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gnochi

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Alternative Brass? Either I've been under a rock or simply missed this: https://www.rokslide.com/battle-of-the-30-cals/
Agreed that more options will be excellent.

I’m boggled that the author wasn’t able to get decent groups with anything with the 300PRC though, including the 225 ELD-M, especially with a Proof blank. Bad chambering job, perhaps?
 
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Westernhntr

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Alternative Brass? Either I've been under a rock or simply missed this: https://www.rokslide.com/battle-of-the-30-cals/ and let me quote:



I've never used Bertram Brass....but I'm highly interested in more players coming to the 300 PRC brass market.
Don't waste your time or money, Bertram brass is tough and that's the only thing it has going for it.
I've used it in my SAUM and it's the most inconsistent brass I've ever used.
Internal capacity variation was terrible, neck thickness varied on every case, and the flash holes were super jagged and in some cases almost completely blocked

it would be nice if LAPUA would consider 300 PRC for brass.
Give it a few years.. I'm betting they'll pick it up
 

8nbait

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I’m finished with load development on my 300 PRC with 9 twist, 26” 3B bartlein

Two loads
78 H1000, 215 primer, 215 hybrid at .030 shoots 2900 FPS

79.8 H1000, 215 primer, 215 hybrid at .030 shoots 3000 FPS

Both loads are very accurate.

76 and 78 of RL26 were also accurate but I haven’t shot them enough to verify completely.

The Hornady data for a 200 eldx seem to mirror my results with a 215 hybrid.
 
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2Barrels

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View attachment 7043948
This is my 300 PRC that we assembled last weekend. Started life as a Remington 700 300 win. Green mountain barrel 1in 8 twist, KRG Bravo stock, Vortex Viper HS LR. She was easily ringing steel at 832 yards. Was shooting factory 225 eld Hornady. It was 5 moa flatter than my buddies 338 LM with 300 grain federal ammo. Love the cartridge so far.
Using CIP length mags with the 300 PRC?
 

DDRH65CM

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I'd like to see ADG brass for the 300 PRC. Like some on the forum and others, I've asked ADG and it's a maybe. Good thing i don't have my 300 PRC yet. Action should be here within a few weeks, i hope. got everything except Action and bbl.

Planning on running in a KRG Whiskey 3 with Accurate-Mag CIP length? (3.7")
 

b2lee

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I don't think you are going to be happy with those 3.715" mags...I run the MDT 3.85" metal mags and I can barely place the edge of a Quarter between the end of a retail 225gr ELD-M and the interior wall of the magazine. Now that I'm running some 230gr A-Tips...I'm running awfully close to that inside wall.

I'd probably single feed if I ran the 250's.

Remember...the 3.715" is the OUTSIDE length....the inside length of the magazine says a Max COAL of 3.625"
 
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b2lee

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Just looking at the SAAMI specs... the COAL is listed as a minimum of 3.575" with a maximum of 3.700". So, the retailer could be running toward the high end and not be able to feed into a 3.715" mag whose internal measurement is 3.625" max.

So, a 3.850" MDT Mag has an internal specified max COAL of 3.760"....so if the retailer does SAAMI max at 3.700" you only have 0.060" left over...and the thickness of a Quarter is 0.069"...so yea..that's about what I said I had left over.
 

b2lee

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Then you'll love those mags....I just wanted to clear up some confusion others might get if they read that the wrong way....I know people build a rifle and pick out all the parts...and then BAM!!! their chassis won't support the mag length they need...and then it is a frustrating mess.

Remember...shoot long and let your gunsmiths prosper...
 
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b2lee

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What are you guys using for ammo management with the 300PRC? I have a Tab Gear Bullet Binder for my 308....but that isn't going to work for these 300PRC rounds. Their long action is only 20rds....anyone got some suggestions?
 

waveslayer

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What are you guys using for ammo management with the 300PRC? I have a Tab Gear Bullet Binder for my 308....but that isn't going to work for these 300PRC rounds. Their long action is only 20rds....anyone got some suggestions?
50 round ammo boxes from reloading