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Old March 30, 2013, 02:30 PM   #41
Join Date: March 4, 2005
Location: Ohio
Posts: 11,526
Originally Posted by Texasyankee
RANDOM QUESTION: If the 7mm Ackley Improved Magnum can be fire-formed from 7mm Remington Magnum brass, how is it that a 7mm Rem has a capacity of around 83 grains, while the 7mm AI Mag seems to have a capacity of only 80 grains?
Welcome to the forum.

If you read through the first page of this thread, post #17 in particular, you will see the 7 mm Ackley Magnum (AM) existed before the 7 mm Remington Magnum, and was originally formed from .300 H&H brass. Unlike the Ackley Improved (AI) series of chamberings, it did not have a parent cartridge you could just fireform to the larger AI size.
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