I just obtained an older but nice looking Rossi .22 pump rifle. I couldnt get it to shoot at the range as it wouldnt pick up rounds when pumped. Checking it at home a strange thing happens, if I only put one round in in the tube it feeds it every time but two or more and no feed, anyone else had this happen? ideas how to fix? this is my first ever pump gun and I am hoping to get it to shoot reliably, should be fun.