I have shot a lot of Gun Club and Federal steel base shells, both new and reloads, and have never had a problem in the Parkers I shoot them in. I use them for trap in a SBT SC and in a VH. They size OK, crimp well, and seem to work just fine. The reloader is a very old and almost worn out Mec 600 jr. I'm sure with a newer loader they would size even better.
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