Crappy ammo has a lot to do with it. A couple of weeks ago I was on the last station of a round of skeet, shooting some old cheap promotional ammo in a very minty Remington M11-48 28 gauge autoloader. The report from the gun on the high house bird was wierd, and the action locked up. When I looked at the receiver, the recoil had ripped the psudo-brass shell head right off the shell and lodged it sideways in the breech. For safety I cleared the action and took the barrel off the gun and looked down the bore, which showed a heavy shadow about 6 inches down from the chamber. You could see daylight through the bore clearly, but something didn't look right, so I took a rod and pushed it through the bore. Turns out when the head ripped off the cartridge, the complete hull casing itself lodged in the bore. I hate to think what would have happened if I hadn't checked it. You can't be too careful!
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