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About LinkBacksThat is on the tight side Friwi my Black mountain is .297" groove is .3075" they were made tight for the ADI 147 gr FMJ projectiles I have heard of groove diameters of .3065"
don't know what the bore diameter of those barrels was, I guess they made custom sizes for particularly bad batches of projectiles they were only military spec stuff for
machine gun ammo
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16-05-2017, 09:18 PM #4Member
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