"I reamed the cases but I have no idea that the neck thickness is right, only that it is much less than the original thickness of the .223 case."
Doc, it's pretty easy to figure out if you've reamed the proper amount.
All loading manuals should give a maximum neck diameter with a bullet seated.
If you're over that, you didn't ream enough.
If you ream too much, however, you can run into issues getting enough neck tension hold the bullet.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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