Quote History Quoted:
7.72mm NATO and .30.06 both shoot a 30 caliber 147gr bullet (plus or minus) at 2750fps (plus or minus). Literally identical performance.
In original loading there were insignificant differences in the actual projectile and different powders were used. M80 and M59 Ball are seated deeper their cases than M2 Ball (.30-06). Cannelure in a different location. No one is producing M2 Ball that I'm aware of and commercial loadings may actually use identical bullets or ANY bullet since there's no standard.
As if the above isn't enough trivia [:] : .30-06 is technically a misnomer as it hasn't been produced since WW1. Real .30-06 (Cartridge, Ball, Caliber 30, Model of 1906) was replaced in the early 1930s with M1 Ball to correct problems encountered during WW1 when the cartridge failed to shoot to the ranges calculated. This was the era of indirect machine gun fire and we were not getting the advertised range. M1 Ball was significantly more powerful but proved too powerful for shooting, mainly on National Guard ranges where the bullets shot beyond the safety range fans, and was replaced with M2 Ball which reflected the ballistics of the original cartridge.
-- Chuck
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While most of this is correct, let me add a couple of things. M1 Ball was not "too powerful". But, with the change from the lighter, flat based Cal, 30 1906 round to the longer, heavier, bolt tailed M1 Ball round came increased range due to better ballistics(streamlining) of the bullet.
To fix that, the Military replaced the heavy M1 Ball bullet with a lighter bullet similar to the original 1906 bullet. However, to make the down range ballistics similar to the M2 AP round, they had to increase the powder charge. So, what they got was a lighter, faster bullet with less range. During WW2, most of the ammo used in Europe by US troops was M2 AP.
The M1 Garand was designed around the M1 "Ball" round.
30-06 1906.........................................150 gr...............2700 fps/muzzle..................2640 fps/78 feet
M1........................................................174.5 gr............2647 fps/muzzle..................2600 fps/78 feet
M2 Ball.................................................152 gr................2895 fps/muzzle.................2740 fps/78 fps
M2 AP...................................................168.5 gr............2775 fps/muzzle.................2715 fps/78 feet
The Author, Jim Thompson, has claimed that the .308Win/7.62NATO case is too small be be able to put enough slow burning powders in to hurt a Garand's op rod. I really can't say if that is correct or not, just passing on info.