Thread: new project. what to do.........

Originally Posted by Kiwi Greg

+1.

My 1-7 twist 22-243 shoots the 90 Bergers at 3100-3200 happily until the barrel gets hot, .552 G1 BC.

I can run them at 3300 with a powder change but the projectiles don't like it & say only 50-60% will get to the target even when it's cold/warm.

I haven't bothered running them that hard apart from testing even though it is blindly accurate with either load.

I prefer that the projectile gets to the target in one piece

My fast twist one would put the 30 Bergers out at 5100+ & 50s out at 4100+, when I improved it there was very little increase in speed

That's why there is no point using a fast twist barrel. I thought the whole point of making the 223saum is to max out the speed and those heavy projectiles require fast twists which vaporize the bullet at high speeds.

I think ill use 60gr GS customs if I can get any. Ill have to find out what twist they require. Any body know?