Greetings Kudu,
The go to load for the .222 R seems to have been 20.5 grains of IMR or H 4198 (AR 2207) behind a flat base 50 grain projectile just about forever. Well since 1950 anyway. The 14 inch twist prevents anything heavier than 50 grains being used. Any powder much slower takes up too much space. Some early Sako rifles had a 16 inch twist so may pay to check.
Grandpamac.




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