Hi: I have a 22/45 mk3 target model. I have fired about 4000 rounds in her. I have never had any ftf or fte at all except for 2 split cases with thunderbolts until I quit using them. Yesterday, using winchester automatch, I had 3 stovepipes with corresponding ftf issues. Advice please. Should I be looking at a new extractor or is it probably just a batch of wonky ammo?