???

I have a 110 that I swapped barrels on. Bought it used, I think it was a 270, but it might have been a 30-06. I put on a 25-06. It's been a year and I don't remember. Anyway, it's a blind magazine. When I try to chamber a cartridge from the magazine it skews the back end of the brass and ends up half out of the gun. Anyone else had this problem and know the cure?