The A-Max doesn't take a longer reamer, it takes a longer mag box. Here is a 50 V-Max and a 75 A-Max, both seated to touch the same throat. It's all about the ogive and where you hit throat diameter, NOT bullet length.

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Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!

Stolen from an erudite CF member.