Loaded 100 55 grain fmj to gift to a friend who bought his first AR at an exorbitant price against my advice. He is a NY transplant and is coming along fine in the 8 years I’ve known him. Slowly being deprogrammed. Bought these 100/pack 55 grain Winchester bullets a couple years ago and never tried them so now they sit on 24grains h335 tucked inside LC brass. No testing, but 24 grains of this will work in any 556.