I have a suggestion: 45 Raptor. You can utilize your existing magazine, perhaps without any modification. X-Caliber will set you up with one, I see he just started advertising it for the AR10 platform so we know they have the reamer. I just did a .458 SOCOM. If my barrel would have been .452 I'd have done the Raptor. I bet we'll start seeing more ammo for it too, especially when the AR crowd latches on to it.
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