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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Why is .284 called a true 7mm?
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<blockquote data-quote="LoneTraveler" data-source="post: 1197307" data-attributes="member: 77249"><p>Today in the world only the United States, Burma and Liberia use a measuring system other than the METRIC system. The military in order to standardize with NATO gave the M-14 ammo a metric designation 7.62 X 51 NATO around the Vietnam War era. Winchester gave it the 308 Win. name when they commercialized it as a sporting round. The 223 Rem. is known as the 5.56 mm to the Military today. </p><p> </p><p> Only U.S.A used world wide measurement today is 42 U.S. gallons = 1 Barrel of crude oil. 1 U.S.A. barrel of oil =158.987 liters in the world market measuring equipment.</p><p> </p><p> 7mm measurement is 0.275591" + .004 X 2 for rifling = .283591 or .284 rounded off to nearest thousandth.</p><p>30 cal. = .300 + .004 X 2 for rifling= .308 U.S.A. </p><p>Once SAAMI set the standards and the barrel and bullet manufactures use the standards its just that way. </p><p> </p><p>Just thoughts of an old U.S. Army Engineer who hauled Kilo's of sand, Kilometers over France in a 5 ton dump truck. 1963-64</p></blockquote><p></p>
[QUOTE="LoneTraveler, post: 1197307, member: 77249"] Today in the world only the United States, Burma and Liberia use a measuring system other than the METRIC system. The military in order to standardize with NATO gave the M-14 ammo a metric designation 7.62 X 51 NATO around the Vietnam War era. Winchester gave it the 308 Win. name when they commercialized it as a sporting round. The 223 Rem. is known as the 5.56 mm to the Military today. Only U.S.A used world wide measurement today is 42 U.S. gallons = 1 Barrel of crude oil. 1 U.S.A. barrel of oil =158.987 liters in the world market measuring equipment. 7mm measurement is 0.275591" + .004 X 2 for rifling = .283591 or .284 rounded off to nearest thousandth. 30 cal. = .300 + .004 X 2 for rifling= .308 U.S.A. Once SAAMI set the standards and the barrel and bullet manufactures use the standards its just that way. Just thoughts of an old U.S. Army Engineer who hauled Kilo's of sand, Kilometers over France in a 5 ton dump truck. 1963-64 [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Why is .284 called a true 7mm?
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