Originally Posted by sagenodland
Doesnt it have more pressure to?..
Yes yes yes the 5.56 mil spec is loaded to higher pressures than the . 223 period proven fact, I have used 5.56 in 223 bolt guns, but it seemed the bolt was hard to open after a shot, could it cause damage imho yes it could, thats why I use 223 in my bolt guns. Some say its the same an will not cause harm but then again, hey its never gonna happen to me right?????