I am loading for a .220 Weatherby Rocket. Any load info you would care to share? I believe I am zeroing in on 760 powder.
How much would you say you can go over .220 swift data?
How much would you say you can go over .220 swift data?
Found 22/250 Ackley info in my Sierra book. Thanks for the tip.You can use 220 swift AI info. I don't remember what I used but I was running a 50 ballistic tip at 4200 and then dropped it to 4150 because once it warmed up outside it was hard to open. I was shooting a ruger #1 and it was hard to pull the block down. This was 20 years ago also so not as many powders available then as now. Remember the are laws of physics. Those who run a 22/250AI with a 55gr. bullet at 4300 fps are way over 60-63k psi. 22/250AI has the same capacity as a standard swift so there for should push a bullet roughly the same speed as the swift.