lots of good powders to do both. WST, unique, bullseye, clays, 700x,231, red dot, herco, WSL if you had some jugs of it laying around. it would be best to see what you have or can get. whatever your running in the 45, if it's working and doing good the 44 mag will work fine with that same powder.......as far as wb specs ,which I take to mean power factor. you need access to a chronograph you have got to make a minimum of 150 pf . everyone I know tries to make at least 160-165 for cushion. a 200 grain bullet has to chrony at 750 to meet the floor. the speed you actually want is 800 feet per second or thereabouts for a power factor of 160........ dusty boddams