Greetings Bos.
IMR4198/H4198/AR2207 has been the go to powder for the .222 Remington since it came out in 1950. The standard load has been 20.5 grains or a little more for the whole time and this is a low pressure load for the 50 grain projectile. You may wish to move the load up a bit for some more velocity. Based on experience of others rifles groups like your better one are quite common with this neat little cartridge.
Regards Grandpamac.
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