gunman41mag
Shooter
The SS-109 or the M855 5.56 cartridge should not be fired out of a .223 chamber unless it is a Wylde chamber. Like the RRA chambers. Another reason to favor the RRA brand.
The leade of the original 5.56 chamber was made longer so that safe pressures are developed for the longer 62 grain steel core penetrator bullets.
The original 5.56 chamber is for the 55 grain bullet and is virtually identical to the .223 chamber reamer. The differences are so slight that they are ignored.
In other words, 55 grain, 5.56 Nato loads can be safely fired out of .223 chambers, but green tip, 62 grain, loads should not be. Unless it is a Rock River Arms, Wylde chamber, AR15.
The Wikipedia article quoted earlier clearly confirms this.
For you unbelievers, lets test it. I have everything we need.
I told him to only shoot 55 grains bullet in the MINI-14