Kraky,
not to be the party pooper....
H 335, is the only powder I have had blow up an action ( although it was repairable) utilizing load manual specs...
it was with a 223, and real bread and butter load, of 25 grains with a 55 grain SP...
and it happened twice!!! no less, one Black Hills load and the other one of my handloads...
I admit, I don't trust it in a 223.. and the couple pounds I have of it, I use sparingly...
it was accurate, but the other down side of it, don't use it for night varmint shooting or shooting prone on top of a dry grass area... or if you do, enjoy the pyro technics of it.....
real "flashy" powder...
