Went to the range today to sight in the Rem 7400. Not so good news. It won't eject the casing after the shot. The slide comes back ( and locks open ) but the casing doesn't come with it. I know the reputation the gun has. I also know that they are as finnikey as can be about being clean. Any specific cleaning ideas? I am using win power point cartridges. If I can't figure this out real quick like, I am going to hunt with the 30 30 all season. It doesn't seem dirty, but then again it doesn't slide back and forth as smoothly as I think it should.