Richard, max I load for 12g is 1 oz for hunting or clays. As Daryl said, keep it to 1200 FPS or less. Most of my loading is in the 1150-1180 range. I've never lost a target or a bird because my shells were under 1200 FPS. Your stocks will thank you. If you don't have 1 oz wads, you can use filler wad under your shot to build up the column enough to achieve a good crimp.
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