ok so I got a Shilen .17 Remington barrel that I've put on an axis .243 I changed the bolt head to .223 and bought a new magazine.I screwed the new barrel on and head spaced it but I can not get it to feed. As I close the bolt it either hits new barrel low and won't chamber or hot the new barrel and go straight up and jam the rifle. When I say it hits the barrel I'm talking the bullet tip hits below the chamber. Theoretically this should work no problem so have I assembled the rifle or bolt wrong? Help before I fall and can't get up!