Bullet is separating mid flight. Almost every round fired minus the first round fired there is two holes. No key holing either. My thought is the bullet was cut down too far when it was converted from 62gr 5.56 to 40gr 5.7. Brass won’t eject from my FN 5.7 MK2 pistol. Only the rifle it feeds.

@@gnomereviews good to know, anyways to keep those puppies held together mid air?