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Old January 2, 2020, 12:47 PM   #20
Senior Member
Join Date: November 4, 2013
Location: Western slope of Colorado
Posts: 3,546
Properly made 300blk ammo will not chamber in a 223 barrel.

I put a heavy crimp in all my 300blk loads. The bullet should run into the shoulder area of the chamber and prevent the bolt from closing.

If the ammo is too short this can be a problem.
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