I like to practice cycling the action of my Mosin-Nagant M44. I usually do this with a couple snap caps in the magazine. I didn't have the snap caps handy, so I was going to put a spent steal case back in just to cycle the action. I wasn't able to close the action. I then tried a brass case, assuming the steal case was crap and the spent brass should be an easy fit. It didn't go any easier. The gun and cases were cold and the gun has been cleaned and lubed. It chambers unfired rounds and my snap caps just fine, it just won't close on the spent rounds. Is this normal? Am I wrecking my gun doing this? Can you wreck a chamber by cycling an aluminum snap cap too much? Thanks for any help/advice.