A cousin of mine once brought me a 37 that belonged to a friend of his to look at which would not extract "High Brass" shells. A couple of gunsmiths had already worked on it & one, or maybe both, replaced the extractor, but it would still jump the rim on a heavy loaded shell.
The solution on this one was something it would seem any gunsmith would have caught, it had a rusty spot in the chamber. A good chamber cleaning & polishing fixed this one & last I heard it was still a Shuking anything he put in it.
