I have a .223 that I put together using an Stevens barrel on an action that was originally a part of a .204 barreled action from the factory. I haven't made any modifications other than the barrel change. Anyway, the nose of the bullets (flat noses) catch the sides of the rear of the barrel when trying to chamber.

Is there a simple mod I can do to make it work?

I took a picture, but I don't know how to upload to this posting.