Ackley improved alterations that show reasonable gains from what I have experienced are. 250 - 3000 Savage, 7 X 57 Mauser and the 30-30 Winchester, the most noticeable improvement is the longer case life as trimming is all but eliminated when full length sizing. Velocity gains in the three mentioned chamberings can vary significantly depending on barrel length.
I would however caution anyone considering the improved chambering in a classic old rifle that the increase in velocity is offset by the devaluation of a nice old rifle. But that will never stop the hot-rodder's from doing what they do. D.H.
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