Greetings @no1_49er,
I used BM8208 in the .222 recently and got excellent accuracy. BM8208 is a dense powder so you don't run out of capacity as you do with AR2206H. I am starting to use the powder in my .223 rifles for the same reason. Your cases will be heavier than the Winchester and with less capacity so a slightly faster powder will help with this.
Regards Grandpamac.
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