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MattLarson · June 26th, 2009, 07:45 AM

.223 Remington maximum safe chamber pressure is ~ 50,000 psi.
5.56 maximum safe chamber pressure is ~ 60,000 psi.

In addition, shooting 5.56 in a .223 chamber may cause significant increases in pressure due to the difference in chamber dimensions.

Do not shoot 5.56mm NATO-spec ammo in a .223 Remington chamber.

There's a ton of good info on this on the net. Here's just one of the many articles out there: The Gun Zone -- SAAMI on 5.56 v. .223 Remington

Matt

June 26th, 2009, 07:45 AM	#11
MattLarson Moderator Join Date: Nov 2005 Location: Central Florida Posts: 2,849	.223 Remington maximum safe chamber pressure is ~ 50,000 psi. 5.56 maximum safe chamber pressure is ~ 60,000 psi. In addition, shooting 5.56 in a .223 chamber may cause significant increases in pressure due to the difference in chamber dimensions. Do not shoot 5.56mm NATO-spec ammo in a .223 Remington chamber. There's a ton of good info on this on the net. Here's just one of the many articles out there: The Gun Zone -- SAAMI on 5.56 v. .223 Remington Matt __________________ Hope is not a plan.