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Then explain to me why military brass has less case capacity and is heavier.
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US military 5.56mm brass does
not have less capacity and it is
not heavier. I have weighed .223 and 5.56mm cases for years. The heaviest cases made are Lapua match. Some Brit 5.56mm cases are very heavy.
Go to the link: Click on Tech and then click on brass weights.
AR15BARRELS.COM - Technical Documents
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Gee, probably all the SAAMI members who must abide by the SAAMI specs for every firearm chamber they cut.
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Not so. For about 25 years Ruger has said that their rifles rifles will accept either 5.56mm or .223 ammo.