SWC is a Semi-Wadcutter Bullet. Some guns will not cycle them because of the abrupt taper on teh shoulder of the bullet. But if you are shooting full metal jacket round nose bullets it shoudl nto be a bullet problem.
there is a possibility that it could be the ramp, mag, or both. There is no way to give you a gooc armchair diagnosis. All i can tell you is to mnually cycle the follower in teh magazine with a stick and see if it feels rough or tries to stick. you should be able to look athte feed ramp and tell if it is rough. It might have a small burr on the leading edge, or start to show a few scratches.
Shoot'em close. Less to pick.
They might get my guns, but they'll get the bullets first !