Will"s right. Between the M4's 14.5" barrel and 1/7 twist, and the M855 round, you've got about 150 meters worth of gun, wound ballistics wise. Past that the M855 settles down into a nice stable trajectory through both air and tissue. I've seen failures to stop with M855 torso hits at >150 meters. I've never had that problem doing it my way.
7.62x51mm, 126 grains @ MV of 2950 fps vs. 5.56x45mm, 62 grains @ MV of 2750 fps. Do the math.
I treat Hajji like any other dangerous game. Big holes, all the way through, are better. Someone once asked a big game hunter in Africa why he used a .600 Nitro Express. "Because they don't make a .700 Nitro Express.", he answered.
I've been doing this for a while now and I'm still here. Either it works or I've been inordinately lucky.
7.62x51mm, 126 grains @ MV of 2950 fps vs. 5.56x45mm, 62 grains @ MV of 2750 fps. Do the math.
I treat Hajji like any other dangerous game. Big holes, all the way through, are better. Someone once asked a big game hunter in Africa why he used a .600 Nitro Express. "Because they don't make a .700 Nitro Express.", he answered.
I've been doing this for a while now and I'm still here. Either it works or I've been inordinately lucky.