Facts aside everybody wants a link. Growing up in a military family with half a dozen vets apparently counts for nothing so here we go. I will post them as I dig them back up. i don't keep them bookmarked because I don't care to.
http://www.globalsecurity.org/milita...t/1986/MVT.htm
7.62mm vs 5.56mm
After that go spend some time at snipercentral, then at urbansniper, then do a search of each of the calibers independantly and compare. Then go get a few rifles of both and see what you get. There is a reason why 223s (or yes even 5.56) go tink on a free swinging 1" steel plate, and 308 or 30-06 damage the plate with a CLANG when you shoot it. Even the 7.62x39 makes a heck of a dent at 150 yards in the steel. Which is probably why you can get ARs chambered in 7.62x39 now as well.
Everybody can also take up a collection and send me enough money to buy an AR-15 and AR-10 a BAR, and a Garand in 308 and I will do the tests myself, video tape it, and post the results if you want. If so I will show the results on steel at 50, 100, 200, 300, 500, 600, 800, and 1000 yards from the different calibers. In fact for that matter I will do the same shots and tests on plywood, car doors, geletin, whatever you want.
Our boys and girls should never carry a rifle not capable of kills out to 600 yards from a single bullet fired prone without ten grand worth of electronics and gear. The marines used to train at 1000 yards without all the extra BS. Someday some terrorist is going to find a way to throw a EMP blanket over an area and our people are gonna get geeked because they depend on electronics WAY to much.
Anyway.
GoodOlBoy
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For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. - John 3:16 KJV
Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be merry: for that shall abide with him of his labour the days of his life, which God giveth him under the sun. - Ecclesiastes 8:15 KJV
"The gun has been called the great equalizer, meaning that a small person with a gun is equal to a large person, but it is a great equalizer in another way, too. It insures that the people are the equal of their government whenever that government forgets that it is servant and not master of the governed." - 40th President of the United States Ronald Reagan 1911-2004