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Another advantage of the short fat mags over the likes of a longer case mag like the 7RM, a barrel chambered in a short mag cartridge you actually end up with a longer rifling length for the same...

You can get Model 7's pretty light, this is my 7SAUM, factory 22" heavy barrel, but fluted.

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My 7mm SAUM is a factory standard 22" barrel, I'm pushing the 162 Amax at 3087 fps with RE26, so id imagine chopping 2 inches off would still achieve 3k+ with 162's