@Jim356 When fire forming from standard non AI cases to Ackley I always struggled and pondered the question of 'what way is best'?
I read and tried all methods, dont know where you are at and you might be doing this already, but the following is the absolute best way:
Take a fired 280 or 3006 case you got from somewhere, neck size 2/3rds down the neck, then progressively turn the die down until the case just chambers with a firm bolt. Examine the case, it will have a small donut ring bulge near the base of the neck that is not sized. When the bolt is closed the case is held firm, camed between this bulge and the case head. Trim and chamfer etc and load with a moderate load, and go hunting. No cream of wheat, fast powder, kapoc and cast projectiles etc etc etc
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