The typical Ackley Improved case gives a modest increase in velocity over the parent case - as long as both are loaded to the same pressures. All one has to do is look at modern tested loading data to verify this - the latest Nosler manual has a number of Ackley cartridges, and the average increase in velocity is on the order of 100 fps. This is simple ballistic fact, not clouded by the rantings and hype of guys trying to sell a product. There is just not enough increase in the case capacity to make a big difference in velocity.
OTOH, the .25-06 Ackley Improved case is much more attractive to me than the old .25-06, and while it may not give a huge power increase it has a major cool factor to it. PO made several rifles for me in the 1970s and while the load data in his books is highly suspect the historical value of his AI cartridges cannot be denied. When I get tired of my .257 Weatherbys I will likely have a .25-06 AI made.
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