I recently picked up a Savage 99 in 30-30. Serial number indicates 1920 Manufacture according to a quick web search. The magazine, in fact the entire rifle, appears to be in great shape. However it is very difficult to feed cartridges into the magazine. At first I could only get two in and after working at it I can now just get three in. The feeding becomes more difficult the more cartridges I load. Does anyone have an idea what the issue might be and how to correct it?