I am also fascinated by the idea of a 270 Ackley but when I fooled with multiple standard 280’s v 280 Ackley & RCBS the most difference I got was 35 FPS. Insignificant!
in my P.O. Ackley book, I recall him saying that AI'ing with 270 was a waste of time in his opinion..
along with the 25/06...
of course that was with powders available during his time....
Most AI
"improvements" are actually more due to
Increased Pressure vice the volume increase due to reduced body taper.
Recall that at the same pressure, MV increases at 1/4 the volume increase. Needs a big volume increase to make a significant increase in MV
The regular .270 and 25/'06 are already factory loaded to higher pressure levels.
