I recently acquired a Model 8 in 35 Remington. It will not extract/eject when firing. I have lightly polished the extractor and the groove it rides in on the bolt. I have also cleaned the chamber using a brass 410 brush and some very fine steel wool wrapped around it with oil on it, run at low to mid speed on a cordless drill. It still seems as though something is causing the dummy rounds I have for it to stick in the chamber and slip the extractor. I have another extractor on order, what else can I do for the chamber? I also have a .30 caliber 8 and the dummy rounds for that one do not stick in the chamber at all. I'm completely stumped at this point but I don't want to give up on this rifle.