Grafs and Maine Powder House come to mind as powder suppliers, there are others, do a google on gun powder. With most all powders 60 grains is 60 grains, the standard of measure is by volumn. I don't use pellets, too expensive and not flexible enough to customize your loads. They are fine if you don't mind paying 4x as much for your powder. Pellets are made by Hogdons in the form of pyrodex and Tripple 7, others make pellets or sticks some call them. They too are in grain (volumn) equivelents. Some brands of powder are more powerfull than others but are all measured with a black powder volumn measure. RWS makes the best/hottest cap, their no. 1075 is what I use and they work great, much more reliable than any other I've used.