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Originally Posted by kurtz
the outside neck diameter of a loaded rounnd with a 125 TNT is .328 to .330, depending what brand of brass you use.....
kurtz
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Wow, that seems like a small diameter... my drawings (Ken Howell's book, as well as SAAMI prints) show .253 neck diameter for the .223 Remington. With a .224 bullet that gives 0.029 combined wall thickness (or 0.0145 each) which is in line with the "typical" value of 0.024 (or 0.012 each).
0.328 with a 0.308 bullet gives 0.020 or 0.010 each .... any chance it might be more than that?