I have been hunting with my 450 bushmaster. The rifle is a a bear creek arsenal. The ammo hornady black. I have been out about 10 times and each time after the unsuccessful hunt, I would unload the rifle and replace the bullet back into the magazine. After the last hunt I ejected the bullet and the bullet was long. I can now push the bullet back into or pull the bullet back out with ease. My guess is that is the bolt slamming the bullet into the chamber has started to work like a kinetic bullet puller. My saving grace is I did not dump powder.