Does the 10mm have thicker brass (than the 40sw) at the base? I don't have experience with the 10mm but have loaded other magnums without a problem. I've pushed the 45 win mag to the max as well as the 357 magnum and 357 maximum. Lyman should have some good starting loads. I still compare the older Lymans and new because as you know they used to load hotter than today.
You might look into some Blue Dot loads for the 10mm. IMO a great powder for magnum handguns.
Now as far as the G20, if someone blows up a gun, everybody's going to hear about it. But I couldn't imagine why you would want to push a semi-auto handgun to it's limits anyway. I'd use a Contender to work up loads if there is any doubt.
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DW
NRA Life Member
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