243 Win Loads

sierracharlie338

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flippn sweet!!! Mine is a PCR barreled action job to a stiller predator action. Had some 4350 but felt I needed something a touch slower, so I tried and tried till I got a 8# stock of 4831sc last week, and it looks good and it was hard to find some data on it so I thought I'd post it just to help out. Gap did a 22-250 with a 8 twist barrel for me this spring. Shootin the 75gr bergers with 4350 at 3200 fps is a PD Killer out here and I cant wait to test it on Yotes!! Rock On!!!!!!
That's awesome!
 

MinnesotaMulisha

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I've got a question for the 243 guys. I've got a Winchester Model 70 Youth Ranger that my Dad bought for me back in the mid 90s. I shot my first deer with it in '96. I still use it on whitetails to this day and now I am going to start reloading for it. I've got Hornady once fired brass and CCI LRPs, and a box of 87 Grain Hunting VLDs that are supposed to be here tomorrow. My barrel twist is 9.5.

I have an over all length gauge, but I believe I will be limited by the length of the mag well. I'm not sure that's the correct term, as the bottom of the rifle drops out and it has a spring attached to the follower. Either way, that's not important right now.

I have two questions.

1. Which powder? I've got H335 and IMR 4064 on hand, as well as some Benchmark, TAC, Varget and IMR 4895. If possible, I would like to use one of the powders I have on hand.
2. I've been reading that the Bergers like to be in the lands, or a decent jump. Can someone give me a good starting length, or should I always start with the SAAMI spec?
 

Tx_Flyboy

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Haven't reloaded for my .243 yet, but i've shot quite a bit of Bergers in other calibers...

In my experience, the VLD like to be .010" (ten-thousands) jammed or .035" (thirty-five thousands) jumped. In three of my rifles, much outside that range, and i got crappy groups...like 1.5 - 2" groups...or single hole groups with the distances i told you.

The hybrids are supposed to be less seating depth tolerant, but i haven't shot those yet.

Best of luck.
 

BallisticPrimate

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It must be a reflection of just how popular the 6x47 and the 6-Creed have become that this .243 thread is buried 5 pages deep. That being said can anyone provide me with some rough velocity estimations for a .243win throwing 105gr Hybrids from a 1/8 twist 26 inch barrel. Powder will be H4350. My smith is spinning the barrel up now and I'm playing around with the ballistics data - hoping to hit 3100fps without pushing the brass (lapua) too hard.
 

xringr

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I have a .243 with bartline 8 twist heavy varmint barrel @ 26".My load is 41.5 grains of imr4350 with 105 IMAX( not for much longer as the 105 IMAX is discontinued ) I have been using ppu brass with cci magnum primers and getting 3100 easy. Not beating brass up either. Very accurate. Hope this helps.
 
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Forward543

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Feb 14, 2017
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I have been using 48.2 grains of retumbo. 105 rdfs, Cci 250's w hdy brass. Getting 3047 fps. High sd of 15.
 

demonjigger

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Factory Rem700 SPS 9 1/8" twist 26" barrel.
95 grain Berger VLD's
46 grains of IMR 7828
CCI 200
Winchester cases
COAL 2.875"
3043 FPS
SD 8.9
1350' above sea level
I could not get 105-108's to stabilize. I could not find much for info on a factory rifle load that really worked. I tried a lot of different powders and heavier bullet combinations before I got to the 95's...
 

XTREM HTR16

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Just bought some 105 hybrids to use in a 20” barrel .243 for whitetail deer here. Adding a 6.5 Ultra 7 suppressor.
Going to start with 41.5 grains H4350 in Lapua brass with Tula LRM primer.
Reckon I can use more than 41.5 and not have pressure issues?
 
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BallisticPrimate

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Just bought some 105 hybrids to use in a 20” barrel .243 for whitetail deer here. Adding a 6.5 Ultra 7 suppressor.
Going to start with 41.5 grains H4350 in Lapua brass with Tula LRM primer.
Reckon I can use more than 41.5 and not have pressure issues?
I just chopped one of my .243 barrels to 21' - I'm interested in how your experiment turned out? Thanks
 

Forward543

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Re: 243 Win Loads

Has anyone ever used 4831SC with the heavies? Looking at most of the loads, it seem to me that most people are using a slower or faster powder then 4831SC with the exception of a couple of people using RL22 which is close to the same burn rate.
I used 4831sc with berger 105 hybrids and 105 rdf. It was accurate but shot at 2850fps out of a 26" barrel. I switched to retumbo 48.4 grn, and am now going 2990fps with similar accuracy. In a 7.7 twist.
 
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redneckbmxer24

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I used 4831sc with berger 105 hybrids and 105 rdf. It was accurate but shot at 2850fps out of a 26" barrel. I switched to retumbo 48.4 grn, and am now going 2990fps with similar accuracy. In a 7.7 twist.
What charge weight was that? 2850 is incredibly slow. My experience has been that 4831 gives much higher velocities than any other powder in longer barrel 243's with heavies. 3300-3400fps has been the norm for me before seeing pressure but accuracy has never been good there and it's way over match speed limits.

I actually gave up on 4831 completely because I found consistency wasn't there compared to other powders. I'd develop a great load that had good ES and SD and then my consistency at distance would be terrible and upon shooting over the chrono again ES/SD were way up. Redevelop the load and same issue. This was with same brass, powder lots, bullets, barrel, and everything. I now use H1000 and H4350 exclusively for 243 and always find a super solid load or two in the 3050-3150 range with 105 Hybrids and it remains consistent throughout the life of the barrel. Neither give the velocities 4831 did because 1000 tops out because of case capacity and 4350 because of pressure.
 
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Forward543

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What charge weight was that? 2850 is incredibly slow. My experience has been that 4831 gives much higher velocities than any other powder in longer barrel 243's with heavies. 3300-3400fps has been the norm for me before seeing pressure but accuracy has never been good there and it's way over match speed limits.

I actually gave up on 4831 completely because I found consistency wasn't there compared to other powders. I'd develop a great load that had good ES and SD and then my consistency at distance would be terrible and upon shooting over the chrono again ES/SD were way up. Redevelop the load and same issue. This was with same brass, powder lots, bullets, barrel, and everything. I now use H1000 and H4350 exclusively for 243 and always find a super solid load or two in the 3050-3150 range with 105 Hybrids and it remains consistent throughout the life of the barrel. Neither give the velocities 4831 did because 1000 tops out because of case capacity and 4350 because of pressure.
I dont remember, i think 42.5 grn of 4831sc. Dont use that as its real fuzzy. Thats where i found the accuracy.
 

Jackomason

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Rifle: Ruger precision .243 win 26" factory barrel, 7.7 twist.

Winchester brass
Hornady 105gr bthp
44.4gr h4831
CCI 200 primers
Length 2.733"

Mv: 3125
SD: 8.9fps
Groups between 1/4-3/8ths
 
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Farmerdanss

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Jun 26, 2018
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20'' Savage 9.25 factory barrel
H4895 33.3G (overmax)
Hornady 105g BTHP
Hornady brass
CCI 200 primers
2783 FPS
ES 12
SD 6
no keyholing at 440 yards..have not tried farther yet
 

6brshooter

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Thanks. I'm having a bartlien 5r 7.5tw med Palma spun up for a curtis axiom in 243 cutright. Pretty cool rd, Jay cutright designed it and used it to win a bunch of 600 and 1000yd ibs trophies about 10yrs ago. 243win case with shoulder pushed back .050 with 243 cutright die, then fireformed in cutright chamber. Results in a longer nk, 37.5° shoulder, body taper identical to 6br. Case capacity is close to 243ai. Jay was getting 3150-3175 with 115 dtac and h4831sc in a 26" -30" barrel7101434
Some win brass with bumped shoulder, loaded to measure nk size. His reamer is .270, but my chamber will be .275 no turn with a .185 freebore.7101435
243win on left, 243 cutright on the right.
 

Chips26

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Jun 11, 2019
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Anyone got any varmint loads?

I've got some got Nosler 70gr purple tips and Hornady 87gr V-max I will be working up soon.
Using Federal brass and Federal 210M primers. Looking at starting with Varget for the Noslers and then IMR or H4350 for the Hornady, but open to other powder suggestions.
 

skidhc

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Sep 28, 2018
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Newnan, GA
Re: 243 Win Loads

I think you will need a 9.25 or 8 twist to get 105's to stabilize.
In my experience (I have shot LOTS of 243), you need at least 1:8 to stabilize 105s but it does vary depending on altitude. I used to shoot 1:8s all the time but tried a 1:7.5 a few years back so I could give 115s a whirl. Although I never really had much luck with 115s (you just have to push them so hard to come close to a Berger 105 hybrid in the wind that it didn't seem worthwhile), I have continued to use 1:7.5s and have never had to worry about stabilizing any 105 anywhere.