I went shooting today using Winchester Super X ammo and a round exploded in the chamber. The casing rim was blown off and the rest of shell casing is stuck in the chamber. It was large explosion. Type : X22LRSS1, lot E127844 I don't see any specific calls on the lot type, but I do see many on the Super X ammunition in general. Any advise on to how to extra the casing. My gun is Remmington Speedmaster 552 auto?