I know they are close to the same and not to fire 5.56x45 out of a barrel thats noted as .223 but does it matter if im reloading them for my m77 .223 , sizing, trim and powder charge, bullet all being the same? Or will i have issues? thanks
When reloading military brass it is recommended that you decrease starting loads by 10%. The military brass has a thicker web and flows more in the 5.56 chambers, they will need to be trimmed, deprimed and the crimp of the primer pockets removed.