Sometimes I think you can hardly make a bad load for the .222, but I suppose it can be done.
I have, or have had, quite a few friends who shot .222s and the three loads I remember hearing about most often have always been:
20.5 IMR4198,
24.0 BL-C2,
25.0 IMR4895,
with whatever 50-53 gr bullet the individual preferred - the IMR4198 load being mentioned most often, by far. The IMR4895 load was always a good one in my guns, and fast, but a real nuisance to load. It barely fits into the case.
H322, H335, IMR3031 are also good. My Winchester Model 70 HB Varmint slightly prefers 25.0 H335. My two Sakos favor IMR4198.
Sierra Blitz and Hornady SX bullets always seem to work well in .222s, as do Remington's plain old 50-gr PSP. I tend to slightly prefer the various 52- and 53-gr BTHPs, mainly for target shooting at longer range.
I have used all of these loads myself. They are close to maximum, if not maximum, published loads in various manuals. In spite of that, they have all shot very well for me, but any third-party info like this should always be verified before attempting to use it, etc., etc.
