You make a good point, Aunsaber. My personal .25-06 Ackley Improved really came alive when I set it back and rechambered it. I am able to get .257 Weatherby ballistics out of it without problems, and the accuracy is very good. But I have seen some .270's, particularly those with shorter barrels, that didn't really seem to "improve" much after being rechambered to A.I.

The best of the Ackley Improved cartridges, IMO, is the .22-250 40 degree. 55 grain bullets can be pushed at speeds approaching 4K. Never have to trim cases. I have one with a Hart barrel that will shoot 1/4" with some loads. And if you back off the charge to middle 3800 range, brass life is amazing. I have a batch of cases that have been fired 21 times - never trimmed - primer pockets are still tight - necks aren't split. How's that for prairie dog economics?