Any experienced handloader can make ammo that will withstand repeated chamberings without bullet setback. Apparently the ammo factories have chosen not to bother with things like dimensional tolerances or quality control. In the last 5 years we are hearing constant reports of factory ammo that sets back dangerously after one chambering. It didn't used to be this way. I guess it's just cheaper to hire some lawyers than to fix the peoblem. If you want high quality ammo then you must learn to reload. Repeatedly rechambering the same round is not a good habit to get into but the bullets should not be so loose in the case that they'll set back after 2 or 3 trips up the feed ramp.