I swapped a .22-250 barrel for a .243 barrel on a model 11 and dropped it into a bel and Carlson m40 stock. It’s DBM, The bottom metal and magazine are factory, and it won’t cycle ammo. Looks like the bolt isn’t catching the round, and it closing over the round. Any idea what’s wrong and how to fix this?

for the record, the rifle shoots under 1 minute with factory ammo.