I will say that while not normally a problem the pumps don’t have the extraction camming power of a bolt rifle. The second buck I ever killed I had to give my 760 a Pogo stick whack on the butt while holding the forend to get it to spit the empty out after the first shot. Likely due to a dirty chamber back before I knew any better.
I've seen a couple rifles (one 760 included) that had a very fine covering of rust in the chamber that would hold spent shells like a vice grip, even with very light loads.
Very fine steel wool on a slotted dowel with lots of light oil chucked in a slow drill fixed them both.
