Hornady's data for the M1 Garand shows two loads reaching 2750 FPS with 150 grain bullets with different powders. M2 ball specifies a 150 grain FMJ bullet at 2740 FPS.
(46.4 grains H-335 under a 150 grain class Hornady bullet and 47.9 grains of Viht N-135 under the same bullet, both loads published in Hornady 10th edition page 524).
How does the Hornady load not meet milspec velocity?
If you don't want to believe Wikipedia regarding the loading for M2 ball I would understand. If we go to https://apps.dtic.mil/sti/pdfs/ADA570469.pdf and look on page 2, we see a reference to M2 ball pointing to citation #11. Citation number 11 is for Frank Barnes "Cartridges of the World" book (which I do not have a copy of).
Are you suggesting that M2 ball was specified by the military to have greater than 2750 FPS velocity?
Ah, now I'm seeing it. We're mixing up the 78 foot velocity as measured by the military vs. muzzle velocity; Hornady tests at 15 feet. If I plug in the numbers with a 150 FMJBT from hornady to get 2740 at 78 feet, I see a muzzle velocity of 2800.8 FPS. If I plug in 2750 @ 15 feel, I see muzzle velocities of 2761.6 FPS. That's a 39.2 fps difference, or a 1.4% difference, the type of difference that might be within the acceptable lot to lot standard deviation for M2 ball (given that as we've seen, some is hotter than others).
(46.4 grains H-335 under a 150 grain class Hornady bullet and 47.9 grains of Viht N-135 under the same bullet, both loads published in Hornady 10th edition page 524).
How does the Hornady load not meet milspec velocity?
If you don't want to believe Wikipedia regarding the loading for M2 ball I would understand. If we go to https://apps.dtic.mil/sti/pdfs/ADA570469.pdf and look on page 2, we see a reference to M2 ball pointing to citation #11. Citation number 11 is for Frank Barnes "Cartridges of the World" book (which I do not have a copy of).
Are you suggesting that M2 ball was specified by the military to have greater than 2750 FPS velocity?
Ah, now I'm seeing it. We're mixing up the 78 foot velocity as measured by the military vs. muzzle velocity; Hornady tests at 15 feet. If I plug in the numbers with a 150 FMJBT from hornady to get 2740 at 78 feet, I see a muzzle velocity of 2800.8 FPS. If I plug in 2750 @ 15 feel, I see muzzle velocities of 2761.6 FPS. That's a 39.2 fps difference, or a 1.4% difference, the type of difference that might be within the acceptable lot to lot standard deviation for M2 ball (given that as we've seen, some is hotter than others).


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