My trusty 550 has started to not feed primers all the time. It is like the primer drops after the seater has moved forward toward the shell plate. The primer ends up either bouncing off the primer slide onto the bench or off the primer slide onto the floor. It happens between 50 -75 rounds loaded. I changed the primer magazine tube and primer seater, but still having an issue. I'm using the large primer setup loading .45ACP. It was running great until last night when it happened several times. Then tonight the same thing. Any ideas as what is going on here? I'll call Dillon tomorrow, but if any of you have had similar issues please share the fix.