Where on the bullet is the mark ? If you take the same round and stick the bullet into the muzzle and give the round a little twist are the marks in the same spot ?
How does your MAX COAL compare to a MAX COAL that will function through your DBM ?
Have you tried single loading a round with the DBM in place ? It's a royal PITA, might ask if anyone has a single shot follower AND if they know if it will work in your DBM.
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