Hi, I'm a first time gun owner and I just took delivery of a new Benelli Nova Tactical 20051 last week. Today I tried loading the gun with dummy rounds. The shells cycle correctly. However, I can only put two 2-3/4 shells into the magazine tube. When I tried putting in the third, when half way in, it felt like it's already hitting the bottom. This is the first time I put shells into the magazine tube, and I'm sure there's nothing inside. Any tips? Thanks!