What Does imr 3031 for 223 Mean?

I realize the aged saying 400gr sound at 2150fps muzzle velocity kills every little thing, but I don’t know how to adapt that to lesser bullets of more compact bore. we could unquestionably deliver 270gr at 2400fps, but would it not be wiser to ship 350gr at 2250fps and would it not have a lot less recoil? Introduced in 1916, DuPont 16 became ce

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