H110 / Win296 , LilGun or IMR 4227 , all of these powdes do very well in the little Hornet , mine loves the 37g Calhoon bullets best , but will shoot the 35g Hornady V-max and the 40g Speer TNT's good also .
Any of these powder / bullet combo's will give you 1 1/2" or less groups @ 100 yards all day long .
stimpy