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Ive gone to 16.2 grn with H110, while it didnt cause a kaboom, i dont know how much hotter you would want to go. I dont have a chrono but i estimate its in the 1300+ fps range.
I know for sure there are .45 colt guys who get close to twice the max load and are fine, different gun of course, but its a testament to Ruger's ruggedness
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