So went to the range today to fire my 1891 mosin. About one in every four round would have to be ejected as the bolt would not close for them. I was firing rounds from the same 20 round paper container. These were Romanian military surplus rounds (red line at the case end). Some rounds the bolt closed with no issue. Others, it took a very firm push to get the bolt to close, the rest, not at all. I have heard about sticky bolt syndrome, but since this was not consistent, I didn't know if it was the same thing or not. It was very frustrating. This was also the first time firing a mosin, and my shoulder is not happy with me. I even have a rubber (albiet very stiff) stock cap on it. I finally had to take the sling, fold it, and place it between the stock and my shoulder so that I could fire more than once every five minutes. As a complete newbie, is this common for WWII rifles? Are there tips and tricks to help reduce this? I had ideas about getting a 91/30 or maybe an M39...but if they call kick like this or worse, not sure if it is worth it. Need some help in surviving my mosin.