My Lyman manual #48 shows 5.0 to 5.2 grains of 231 with 155-160 LSWC for +P loads giving velocities in the mid 900 FPS range. I use 5.0 with no problems at all.
If you want more, Alliant powder shows a charge of 6.0 of Power Pistol for over 1000 fps on their website for .38 +P.
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All that is neccessary for evil to triumph is for good men to do nothing.
Edmund Burke
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