I use 21grs/Green Dot with 1 1/16oz of shot. The book shows 29 with 1 1/4oz, so I'm pretty sure I'm plenty safe. Many of the loads are out dated, but there is still many loads with available powders. You'll just have to make do, or as many of us do - use a 12ga load of moderate pressure - it will most certainly be safe in a 10ga [ larger chamber = less pressure ]. Good luck.
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Paul Harm
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