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The problem you run into is that mil spec 5.56 is made by damned near every ammo plant in the world. You run into a lot of variation in case/neck thickness, case length, and OAL, not to mention powders and primers. Every one of those parameters effects case pressure.

A 5.56 chamber is more forgiving vs a strict .223 reamed chamber. The one time where you do want an actual .223 chamber is if you are going to be using your rifle for target/accuracy shooting, and you will only shoot actual .223 cartridges.
"Oil leak, what oil leak? That puddle under the car is just sweat from all that horsepower."
Old 12-04-2012, 01:23 PM punisher is offline  
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