That means its only proofed for the 223 sammi spec loads. 5.56 is significantly higher pressure. Some people use 5.56 in a 223 but I don't see the point.
What are you wanting to use the ammo for?
That means its only proofed for the 223 sammi spec loads. 5.56 is significantly higher pressure. Some people use 5.56 in a 223 but I don't see the point.
What are you wanting to use the ammo for?