alsaqr
Member
223/5.56 six of one, half dozen of the other...........
Bingo!!
My first .223 was a .222 Sako that i had re-chambered in 1968. i still have that gun, its been through a few barrels and has fired at least 20,000 rounds of M193 5.56mm ball ammo. My other .223 rifles routinely fire 5.56mm ammo. i would not fire 5.56mm ammo in a tight match chamber.
NEF had this nasty habit of re-grinding their chambering reamers. Some of their guns have huge sloppy chambers and some have tight chambers: Some give pressure signs with factory .223 ammo.
SAAMI: Where are the kabooms?