jather
I love my little Jet , all my brass are formed from new 357 mag case's not factory ammo and I get real good case life . As for powders , I have found that IMR 4227 and H-110 do the best for me when using bullets in the 35 to 45 grain range .
I just use standard small rifle primers and don't see any real issues from them , just be warned that forming the case's can be a royal PITA if not done properly .
Also as for LilGun , its just too picky for my taste , just as little as .02g has caused pressure spikes to the point of sticking brass and flattened primers .
stimpy