Originally Posted by
boggle
They also mention the 556 has a thicker sidewall for its higher pressure.
I've got a 556 chambered AR. So does this mean perhaps if I shoot 223 cartridges through it and try to reload those that over time those may become weaker faster since they aren't designed that for the pressures that the 556 chamber produces? Maybe I should try to just buy 556 casings then....
So to answer my own question I guess those dies would be fine. My only concern. Is that when 223 rounds are fired in a 556 chamber, wouldn't that deform on the chamfered neck of the casing since it's unsupported in that small area?
What is going on on this site? There's almost no differences in .223/5.56 brass in most cases. As far as firing/sizing, there is no difference at all. A 5.56 chamber has some leade differences, but the brass can be used/sized interchangeably.
There are a few odd ball brass variants that have internal volume differences.... MEN, small font PMP, etc. Those can cause pressure variances due to decreased internal case volume.
MEN brass, for example, bumped velocities like 40 fps on one of my loads. But again... sizing/firing is irrelevant to chamber.
"What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v
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