Well I did know a guy with a remington 1100 semi that always a jam-o-matic with reloads if he didnt resize properly.
Back in the early 80s when reloading for 12g was very cost viable.
Mate caught him not going all the way down on the sizing/depriming stroke.
Got told very quickly to not do that
Very little issues after that.
Definitely a mec of some type. Seemed to be a very popular reloader back in the day
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