I would start with the following:
5 gr. Bullseye
8 gr. Unique
5 gr. Red Dot
5.5 gr. WW231
These should give you velocities in the range you wish, however make sure you check your cylinder throats diameters and make sure your bullets are not more than .001" smaller than the tightest throat. Ideal would be the same size or .0005" larger.
David Reiss - NRA Life Member & PSC Range Member Retired Police Firearms Instructor/Armorer
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