One magazine to rule them all

Joined
Jul 24, 2015
Messages
64
Well, maybe not ALL, but I'm building a new rifle on an AG composite stock with an origin action. I ordered CIP length bottom metal as I want to use it for both 7mm PRC and 300 PRC using prefit barrels.
My question is around magazines. I see folks like grayboe have multi caliber magazines that for both of my calibers and then some.
Any experience with these type of multi caliber mags?
 
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