Accurate #5 or #7 will serve that need well, giving the edge to #5 for generating near identical(or better) velocities with less powder. #2 is just a tad fast for the 10mm, and can generate some rather impressive pressures with the heavire bullets in 40(which doesn't stop me from using it with 180s). Other options include Universal(probably the most versitale powder out there) and Power Pistol.
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