Need help in gettin a Model 1892 to load.|Winchester Rifles|Forum|Winchester Collector

Fellows: I have a beautiful Winchester 1892 that is having difficulty in loading. It is a 25/20 Octogan barreled case colored Winchester. When I try to load the gun, the front of the bullet goes straight up instead of into the barrel. My gunsmith did not know how to fix it. I have others that load perfectly, though they are in 44/40. Does anyone have any idea what is going wrong and how to fix it. Or someone near me that has the knowledge to fix it? I have a factory letter on this gun, but little to no information other then when the gun was made and shipped? Thanks