It will be hard to get a 55 grain to go subsonic in a .223 with any powder a 45 grain cast bullet in the .22 hornet with 2.0 grains of Red Dot is still super sonic, if you have a 7" twist barrel and use 80 grain Amax you may have a chance.
It will be hard to get a 55 grain to go subsonic in a .223 with any powder a 45 grain cast bullet in the .22 hornet with 2.0 grains of Red Dot is still super sonic, if you have a 7" twist barrel and use 80 grain Amax you may have a chance.
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