I used one or another Mec presses to reload brass shells, and for that reason I used 10ga OP and OS cards. Used the 11ga cushion wads. From shooting muzzle loaders for over 50 years a tight fit was usually used. To get a tight fit with Magtecks a 11ga wad, OP and OS, weren't getting the job done. There's a mechanical advantage when using the Mec that allowed using two sizes bigger wads. Just my experience.
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Paul Harm
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