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It's a minor point, but to be an Ackley Improved, it MUST be made from a factory cartridge that can be fired in the improved chamber ... there is no factory .22-6mm Rem, so there is no 22-6mm Rem Ackley Improved.
It is just the 22-6mm Rem.
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Here is a list of Ackley Improved and Ackley cartridges...
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* .22/.30-30 Ackley Improved , a .30-30 Ackley Improved necked down to .22 caliber (5.56mm)
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Does this mean I can go buy a .22/30-30?????
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I think the point is that everyone has coined the suffix AI to mean 40° shoulders (the ° is on the computer). Maybe not that PO himself done it, but (someone) merely used his method of improving a case. Instead of coming up with another name or saying out 40 degree improved... the AI just rolls off the tongue. Yes, I also have both his books, I'm not claiming they made me an expert...