I have used both STS and Gun Clubs in 20ga 3/4oz Clay Buster wad with chedditte primers. I much prefer the gun club to STS, I get much better crimps. The STS hulls are thicker at the mouth which causes a slight mushroom at the mouth making it necessary to push the shell into the chamber of my Fox, I don't have this issue with the Gun Clubs with the same MEC 9000 press. Also make sure your resizing to suit your chamber---Foxes are normally tight.
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