300 PRC update

rockin randy

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I’ve been on the list with adg. I have enough Hornady brass to get me by until they release to us the unwashed masses. I do look forward to it tho
 

rockin randy

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I’m waiting to see what manners offers for the 2020 group buy. My 300 PRC needs a better home to love in
 

outlawpsd

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Really curious if anyone can answer this. Two PRC’s running Bartlien 9 twist both sped up 40 to 50 FPS between 200 and 230 rounds. I’m use to barrels speeding up way sooner than that. I’d have figured a mag like this would have sped up before 150 rounds.
 

b2lee

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Really curious if anyone can answer this. Two PRC’s running Bartlien 9 twist both sped up 40 to 50 FPS between 200 and 230 rounds. I’m use to barrels speeding up way sooner than that. I’d have figured a mag like this would have sped up before 150 rounds.

My question to you....are you sure they sped up? What I'm trying to ask is....did the barrel speed up....or with the changing seasons.....is it warmer outside now than when you first started shooting it? I've shot in conditions recently at 15F and 70F....and the speed difference is measurable.
 

JB.IC

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Anyone have quick load?
testing 8133 tomorrow and just want an idea where it predicts max load.

Bergers 230, 9 twist, 29”
 

b2lee

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I don't have any data on IMR 8133. I've read people who say they use Retumbo data....but then they compare it to the slower burning RL-33. If it is like RL-33...I say don't even bother.

I found reduced speeds and high pressure early with RL-33 on a 230 and 250 grain A-Tip. Retumbo was my go to load before I got some N565. N570 was about like RL-33 for me....slow and pressure signs early.

So...that said...if it were me...I'd start lower than Retumbo and work up.
 
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JB.IC

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I don't have any data on IMR 8133. I've read people who say they use Retumbo data....but then they compare it to the slower burning RL-33. If it is like RL-33...I say don't even bother.

I found reduced speeds and high pressure early with RL-33 on a 230 and 250 grain A-Tip. Retumbo was my go to load before I got some N565. N570 was about like RL-33 for me....slow and pressure signs early.

So...that said...if it were me...I'd start lower than Retumbo and work up.
I’ve started way lower than Retumbo because the case fill. About 75-76gn is when 8133 will start to compress. That alone is an indication that the data will not be the same.
 

b2lee

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yea...generally I fill to where the bottle neck starts...and seat to where the boat tail and the neck meet.
 

b2lee

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Correction....4 left in stock. I only grabbed two. I have pre-orders in with a few others....and I just bought another PUG 3D ELR bag with the light fill....and I still gotta eat this week....and I ain't missing a meal ;)
 
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b2lee

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The picture of the brass below is in response to some of the pics I've seen of other people's brass with questions about loads and brass quality. I've seen some ugly stuff. Below is 8x fired Hornady brass. On these particular 5 rounds, they were initially fired with 225gr ELD-Ms with a stout Factory load. Each reload has been with 78.5 grains of N565, a 225gr ELD-M, and a Federal 210M primer. After the first loading I had a pretty good trim down to 2.565. After that I barely touched a 1/2 thou off of any one of them maybe once or twice. They simply aren't growing in my Defiance Deviant/Bartlein combo chambered by Greg and Russ at SPR...aka.. Bugholes.

These are uncleaned, unsized. You will see a little powder residue around the necks...and you will see some tiny dimples where it slung out and hit the ground...and you will see some verticle scraping from my tight MDT 300WM CIP mags. You can see where the sizing die stops and doesn't go all the way down to the head. When these are cleaned up...they will be so shiny they look like a brass pole in a strip club.

While I've lost a few to primer pockets failing....that was MY fault. They were pushed with 80+ grains of powder to as much as 3100fps in a 28" barrel. So, while Hornady brass may be 'sub-standard'...it has held up rather well....and given me the opportunity to shoot at distance with an accuracy I never thought I was ever capable of.

Now, in a few days....my journey with ADG brass will begin...and we'll see if I can quantify the difference between the two.

300prcBrass8x.png
 

JB.IC

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Correction....4 left in stock. I only grabbed two. I have pre-orders in with a few others....and I just bought another PUG 3D ELR bag with the light fill....and I still gotta eat this week....and I ain't missing a meal ;)
was the last part a Taylor Swift song?
 

high right

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The picture of the brass below is in response to some of the pics I've seen of other people's brass with questions about loads and brass quality. I've seen some ugly stuff. Below is 8x fired Hornady brass. On these particular 5 rounds, they were initially fired with 225gr ELD-Ms with a stout Factory load. Each reload has been with 78.5 grains of N565, a 225gr ELD-M, and a Federal 210M primer. After the first loading I had a pretty good trim down to 2.565. After that I barely touched a 1/2 thou off of any one of them maybe once or twice. They simply aren't growing in my Defiance Deviant/Bartlein combo chambered by Greg and Russ at SPR...aka.. Bugholes.

These are uncleaned, unsized. You will see a little powder residue around the necks...and you will see some tiny dimples where it slung out and hit the ground...and you will see some verticle scraping from my tight MDT 300WM CIP mags. You can see where the sizing die stops and doesn't go all the way down to the head. When these are cleaned up...they will be so shiny they look like a brass pole in a strip club.

While I've lost a few to primer pockets failing....that was MY fault. They were pushed with 80+ grains of powder to as much as 3100fps in a 28" barrel. So, while Hornady brass may be 'sub-standard'...it has held up rather well....and given me the opportunity to shoot at distance with an accuracy I never thought I was ever capable of.

Now, in a few days....my journey with ADG brass will begin...and we'll see if I can quantify the difference between the two.

View attachment 7252873
Exactly what I've seen. First, I did the 300 PRC over the Nosler for 3 reasons.
1) Nosler brass sucks!
2)Nosler brass is expensive
3)Noslers brass sucks!
I cleaned the necks on the PRC Brass, prepped it, and fireformed 300 pieces.
I have 50 pieces I've just used for load development and to see how many firings I'm getting. So far, I've got 5 reloads on it and haven't lost any yet.
It really isn't that bad plus, at 80 some cents a piece, I'm ok with it. I'll wear the barrel out before I wear the once fired stuff out. Maybe the ADG or Peterson stuff in the future. I'll see how it does for others. Will the groups shrink? Time will tell. But for now, the Hornady stuff is doing well.
It reaches out to the distances I built it for with good Accuracy. No complaints.
 

abn31c

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I loaded 1 piece of Hornady brass 8 times in a row 215 hybrid, 79.3 H1000 cci 200 and primer pocket was still tight enough to bring joy. Not feeling the need for more expensive brass at this point. Hornady brass got alot of it's bad rap from guys consistantly running over pressure in 6.5 creedmoor.
Just sayin......
 

b2lee

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So as I predicted earlier...it would be too slow...and start to show pressure early.
 

8nbait

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I was going to try some 8133...thinking it was similar to retumbo.

Thanks for saving me the trouble.
 

JB.IC

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just as I told my buddy who advised the same, when you have 40lbs of a powder and all the other optimal powders have been out of stock for the last 6 months..... you have to try the powders you have. Can’t shoot what you don’t have.
 

Cestes50

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It looks like you shot two for each 8133 load. Just curious if any looked like they had potential for grouping even though low Velocity.
 

JB.IC

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It looks like you shot two for each 8133 load. Just curious if any looked like they had potential for grouping even though low Velocity.
Was shooting at steel targets that were all shot up so I’m unsure what the groups looked like.
 

b2lee

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Was shooting at steel targets that were all shot up so I’m unsure what the groups looked like.
I like center punching steel plates....I'm not one for shooting 100yd paper all day. I shot a 308 group yesterday with a 3-9x scope...and was like 'this is some BS' when it was a huge .75" group. I had to dial back my expectations...given the scope used. But I could center punch steel way out.

Sometimes I like shooting the 300PRC for paper groups when friends are around...so I can argue with them that there are multiple shots through the same hole....and no...I didn't miss that 12" wide target or the 24" target backer behind it.
 

TripleBull

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I like center punching steel plates....I'm not one for shooting 100yd paper all day. I shot a 308 group yesterday with a 3-9x scope...and was like 'this is some BS' when it was a huge .75" group.
The shortest our 300 PRC has been shot is a mile. But we've only shot factory ammo. I'm about to work up a load and will have to go short. Gritting teeth.
 

JB.IC

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I’m not a huge fan of shooting groups while doing velocity/pressure checks. I also don’t like shooting groups when doing velocity node checks. I don’t want to get wrapped up in trying to shoot tight groups and cook a round in the chamber and then wonder why it’s 40fps faster than the average.

seating depth nodes is when the group work comes. Shooting groups has to be the most boring thing in the world but hearing that steel ring ;) that’s music
 

rockin randy

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Shooting groups, shooting steel, shooting clays, shooting chipmunks, shooting into the dirt dumping a mag...

And my Father used to say, there’s isn’t too many guns I don’t like to shoot.

I love shooting groups. Paper, steel. Close, far... beats spending the time at work
 

Cestes50

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I haven’t shot groups since my load development. It did make me smile when finished. We have steel starting at 400 out to 1k and just cleared for 11 and 12. Hope to get those setup soon.
 

rockin randy

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Does anyone know if MPA chassis accept CIP length mags for the rem 700 LA inlets?

That dang b2lee has me checking out chassis now.
 
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Merovingian

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Oct 6, 2019
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I’m not a huge fan of shooting groups while doing velocity/pressure checks. I also don’t like shooting groups when doing velocity node checks. I don’t want to get wrapped up in trying to shoot tight groups and cook a round in the chamber and then wonder why it’s 40fps faster than the average.

seating depth nodes is when the group work comes. Shooting groups has to be the most boring thing in the world but hearing that steel ring ;) that’s music
This was interesting, so I'm going hijack a bit. Curious to see about work up processes. I use a modified OCW. Starting .010 off (or as close as I can comfortably get) I run 5 initial 3 round strings in 5% increments with the high side being 5% over max at 200y (doesn't mean I shoot it, it's just there if things are holding up). Normally, that'll find a node. Then I'll bracket the node 3 x 5 round strings at 200 to confirm. Then 3 x 5 at 500 varying the seating depth +.010, +.020, +.030. I don't bother shooting the initial depth at 500 because I've got a good idea of what it will do after the 200y strings. Then 2 more 5 strings at 500 to confirm. So I'm basically 55min down the pipe when done. From there, grab the 15" gong and walk it out to a failure point. Thoughts? Welcome any input if anyone has a more efficient process that's working for them. Other methods I've tried haven't panned out and really would like to find a way to get there confidently in <30.
 

b2lee

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Do the the ACC accept CIP length mags?
Yes, It is the reason I went with it. Initially I was going to go with a J Allen stock/chassis....when they won't accept your money....and won't return emails...you know something was up....and then they went under.

Hopefully MDT releases their J Allen stock this year...and I'm going to grab one of those for a build.
 
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