I recently obtained a no1 mk3 enfield from a gun show and the round got stuck in it the first time I fired it. I got the round out fully intact by tapping it with a rubber mallet and ammunition I was using was new from Sellier & Bellot. I’ve been trying to inspect the round to see if it’s expanded near the rim and it doesn’t look like it has, I also scraped a bent paperclip on the inside to see if it would catch and it didn’t. I placed it next to another unfired round and you can see it became a bit deformed on the other end at the top where the bullet was after firing (see image). Is that normal? Any ideas what the issue may be?