""set back"? Or, did you mean, "jump forward"?"
Good question. I think of 'set back' when the round is jammed into the feed ramp and as I shoot more self feeders, there is my mind set.
I think of 'jump forward' in a heavy revolver loading trying to 'pull the bullets' the the remainder of the cylinder.
So, it could be either, depending. Good neck tension covers most.
Enjoy,
OSOK
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