243winxb
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The primers are not at fault. He recorded higher velociity, along with higher velocity come higher pressure.
how did this load go from safe to dangerous?
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USSR
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And bullet ogives can vary as much 0.010" with Sierra MatchKing bullets. That is why I don't seat bullets any closer the 0.010" off the leade for cartridges that are not intended to be soft-seated.
Don
cheygriz
member
TWO, repeat, TWO things can effect pressure. Powder, and primers!
If you don't believe me, try shooting carefully measured charges of powder from the same gun with both standard and magnum primers.
If you don't believe me, try shooting carefully measured charges of powder from the same gun with both standard and magnum primers.
USSR
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Yep, two things among many other things.
Don
Tom S.
Member
According to Quickload, you are 2500psi over the recommended max of 64,542 psi. Being that close explains why little things like heat can push you over the 'too hot' limit.
Funny how the pics showed heavily cratered primers without much pancaking? Maybe those couple of cases were shoulder pushed too far back? "Variations" happen in production even handloading 
I have tuned about 15 load combinations over a chrono the last few years and what i've learnt is to test your chosen powder with different type primers to check that they progress evenly in velocity as you increase the powder load. Its a real eye opener some primers spike the velocity all over the place but then a different primer ignites that powder really linearly, my favourite primer is the RLRM its never been a bad choice in everything i tried it in.
The Fed 215 and CCI LR have had the most problematic results for me. But in some combos they are the best!
I have tuned about 15 load combinations over a chrono the last few years and what i've learnt is to test your chosen powder with different type primers to check that they progress evenly in velocity as you increase the powder load. Its a real eye opener some primers spike the velocity all over the place but then a different primer ignites that powder really linearly, my favourite primer is the RLRM its never been a bad choice in everything i tried it in.
The Fed 215 and CCI LR have had the most problematic results for me. But in some combos they are the best!
Innovative
Member
Use REAL caution when handloading cases like the 300 wsm. That's an EXTREME high pressure cartridge. It was intentionally made that way to compete with the performance of the 300 Win Magnum. These days we have lawyers behind every blade of grass, and it's surprising that they ever let the 300 wsm get to production. It has a bit more chamber pressure than I feel comfortable with. Handloaders . . . . go easy loading this caliber.
- Innovative
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as i mentioned regarding primers... i am, for better or for worse, married to cci for now. so i just don't have much flexibility, there. more's the pity.
i reworked the load today using rl-17. i found a load that i am satisfied with. it isn't as accurate as the 4350 load, but my velocity is running 3135 f/s and single digit sd's. since i was loading at the range, i was able to test a bunch of loads, and proof out my best load. no unexpected pressure excursions. i took the load up to 3300 f/s, which was too hot, and settled on my accuracy load, which should be plenty good enough to kill whatever needs killing at whatever range it needs killed at.
just got done annealing the cases, sized them, and they are in the tumbler now. now that the weather is warming up (getting into the high 60's tomorrow - 10 degrees warmer than today when i worked up my load - i will have ample opportunity to see how rl-17 performs in hot weather, and see if there are any further nasty pressure surprises.
btw... love loading at the range. i ran a ladder test, went back and shot a couple groups w/ the charges indicated by the ladder, ran a proving group w/ the best performer, put a couple more between the sticks just to be sure, sighted the gun in, couple more groups to be sure, then a couple groups just for fun... no way in tarnation could i have done that in one day if i had to go back home (4-5 miles) load the cases and go back. kinda cool... every time i needed more ammo, i just turned in my seat and stuffed some more cases.
i reworked the load today using rl-17. i found a load that i am satisfied with. it isn't as accurate as the 4350 load, but my velocity is running 3135 f/s and single digit sd's. since i was loading at the range, i was able to test a bunch of loads, and proof out my best load. no unexpected pressure excursions. i took the load up to 3300 f/s, which was too hot, and settled on my accuracy load, which should be plenty good enough to kill whatever needs killing at whatever range it needs killed at.
just got done annealing the cases, sized them, and they are in the tumbler now. now that the weather is warming up (getting into the high 60's tomorrow - 10 degrees warmer than today when i worked up my load - i will have ample opportunity to see how rl-17 performs in hot weather, and see if there are any further nasty pressure surprises.
btw... love loading at the range. i ran a ladder test, went back and shot a couple groups w/ the charges indicated by the ladder, ran a proving group w/ the best performer, put a couple more between the sticks just to be sure, sighted the gun in, couple more groups to be sure, then a couple groups just for fun... no way in tarnation could i have done that in one day if i had to go back home (4-5 miles) load the cases and go back. kinda cool... every time i needed more ammo, i just turned in my seat and stuffed some more cases.
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