Greetings Magnetite,
I tried 49 and 50 grains of AR2213SC behind the 129 grain SST which gave 2,720 and 2,780 fps respectively. You may get a little more. As far as your accuracy figures go you could shoot that string again and get completely different results. For accuracy testing the average of three, three shot groups would give you a better idea.
Regards Grandpamac.
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