As a 20+yr shooter/reloader of the fantastic Fireball, I've tried a lot of powders. But several yrs ago the AA1680 load under any of the poly-tip 40gr pills became the best go-to load for either of my Fireball rifles. Very fast AND accurate.
RL-7 or LilGun are close seconds. AA's 2200DP also works well, and maybe the new 2200 will also.
I seldom use the 50's, but did find good loads using H322 or AA2015.
Several new powders have come out that are likely applicable, but I doubt I'll move away from 1680.
