I am also planning a rifle in 25/06 AI and this will be my third improved rifle project. The other two were a 223 and 22-250 both improved and velocity increases on those rifles were around 250ft per second not a huge gain but did make quite a difference to the trajectory of the bullet.
Having read both of Ackley's books his improvements worked well on some cartidges but not quite so well on others, One thing to keep in mind is that Ackley's words were written nearly 40 years ago and he did not have access to some of the powders that we have on the market today (especially the slower ones) Velocity increases were usually in the order of between 5 to 15 % of original maximum velocity of the parent case but some were lower and a few were higher.
Its funny that the 22-250 AI was not a cartridge he rated very highly but it has turned out to be a very popular cartridge with the varmint fraternity.
Murray
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