WW 748 in the 222
I have never had good luck with relatively slow powders in the 222. My best loads involve 4198, Rl 7, and the now discontinued AA2200. H322 made small groups, but not at max velocity. H335 didn't work well in my rifle, but it makes for tiny groups in my 223. If I had to choose one powder it would be 4198 (either). If I had to load lots of rounds, I would choose RE 7, as it meters well. My rifle doesn't like the pointy 40 grainers, but shoots 42 grain Calhoon bullets extremely well. If I had to choose one load, it would be 20 grains of IMR 4198 and the 50 grain Sierra Blitzking. Whatever you gain in speed with the 40 grainers over the 50s you lose after about 100 yards. This load gives about 3,250 fps in my rifle with 23" barrel. That's about all there is in the 222.