I'm looking for a powder that will do double duty for .40 S&W and 10mm plinking loads with 155 gr SWC lead. I'd like something that burns clean, meters well, and is relatively low density. I asked around and found that a single based powder is probably what I'm looking for. Its less dense, and usually requires more mass to do the job. (I'm trying to be wary about double charges). Anyone have any recommendations as to what powder to use? How about a "central" source for powder characteristics? (is single/double base, load density, muzzle flash, burn rates, how clean it burns, etc etc) Wanna kill these ads? We can help!