Shotgun has fired about 100 shells and always cleaned after. Recently it has stopped firing for no apparent reason. it feels like the trigger is stuck but only on live shells. It will fire dry, It will fire with snap caps, loads and ejects just great but load any sort of live shells and it will not allow the trigger to pull and will not fire. Tried 6 different brands of shells but no difference. The action seems smooth with some amount of resistance as the left extractor rubs past the eject screw but the bolt seems to locate just fine. I cleaned it before a trip to the range yesterday, it fired the first round good, ejected and loaded no problem but then the tried to pull the trigger and the trigger feels stuck ( different feel than the safety being on).I'm thinking that something is out of alignment, any help would be good.