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Sparky4
Reply with quote  #1 
Hello, I'm interested in building a 22-6mm AI or a 22-243 AI and like to use bergers 90gr Vld. My question is can this bullet hold up to 3500+ FPS and what is the limit velocity wise. Real world experience is appreciated. Thanks, Jason.
fdshuster
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Jason: PM sent
cr500
Reply with quote  #3 
I had a 22/6mm imp with 7, 8 and 9" twist barrels. The 8" twist would sort of stabilize the berger in warm weather if I was at a bit of altitude, but accuraccy was OK but not great, obviously only marginaly stable. With the 7" twist, accuracy was better, but when pushed hard, the bullets blew up. This was with the 90gn sierras and the old J4 jacket Bergers. This was before the new thick jacket Bergers were out, so they might help. I was able to get up to about 3600 fps, with 1 in 10 bullets blowing up. You will need a smooth, well lapped barrel and preferably use moly/Danzac/HBN to get bullets to stay together. Will this rig be for target or varmint? If I is for target, I would say neck it up or shorten it down to maybe a 22x47. For varmint hunting I would use a 9" twist and use 75gn (Not 80gn) A max bullets. With the 75gn pills in a 9" twist, you will be able to get some bigger speeds.
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