Unfortunately for rife there is no magic recipe that's going to get you a perfect load right away. You're going to have to do some research and experimentation in order to figure out what your rifles like. I've never reloaded .270 but for .223 out of my 24" AR with a 1/8 barrel and 69gr sierra's I had good success with Varget. For lighter bullets I used Winchester 748. Now as far as pistol goes I really like the Vihtavuori powders, but they are expensive and get scarce. So for everyday plinking loads out of a 9mm, .40 and .45acp I always liked Winchster WST or 231. Those powders are cheap, clean, consistent and readily available.