Okay, I'll brush and mop it out good. Keep in mind its a chrome lined chamber, it looked mirror smooth before I started shooting and it looks that way now. Its hard to get a pic of it with my phone but itbis bright and shiny and smooth in there.Stuck case, look at all the rub marks. I’d polish up the chamber seeing that the rifle is new. Gets rid of all the tiny machining marks. Steel ammo allows a lot of blow back into the chamber because it doesn’t expand like brass and that’s what jambs you up.