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Old 11-18-2004, 09:31 AM   #1
 
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M1/Ballistics on the .276/.256

Hi all,
Well you guys wanted an easy one so here it is:
During testing in the later 1920's Ordnance was looking for the new semi-automatic rifle to be in a .276 caliber, but look wait, Ordnance also was looking for the new semi-automatic rifle to be in a .256 caliber. My qustion is what was the Ballistics to be between the .276 cal. and the .256 cal. for the M1 Garand rifle? Have fun
http://www.garandm1rifle.com
http://www.users.fast.net/~eclancy
Thanks again for taking the time and effort to read and reply to this.
Clancy
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Old 11-18-2004, 09:22 PM   #2
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According to my sources, there were several different .256 (actual diameter .264") rounds tried. An early one appears to be inspired by the 8mm Lebel case and was primarily tested with 140gr bullets at 2,600-2,750fps per the original Ordnance recommendations. However, later test cartridges used .30'06 cases, both full length and shortened. The Pig Boards used one of the shortened variants with a 2.199" long case loaded with 125gr bullets at 2,650fps.
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Old 11-19-2004, 11:14 AM   #3
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I don't know about the .256, but I beleive the .276 was to be 125 grains with a muzzle velocity of 2,700 fps.

edit--I take that back, I think I'll agree with the above post on the .256.
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Old 11-21-2004, 11:48 AM   #4
 
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Hi all,
The answer to this quiz is as follow:
Ordnance Technical Staff
Dec. 1, 1927
Items 5601-6375 OCM
Bullet flat base
Gilding Metal Jacket, Weight 140 grains
Powder Charge Sufficent of a Suitable Military Powder
to give a Muzzle Velocity of 2600 fs.
This was the data for both rounds
One of the Ordnance Officers signed is Capt. James L. Hatcher
http://www.garandm1rifle.com
http://www.users.fast.net/~eclancy
Thanks again for taking the time and effort to read and reply to this.
Clancy
ps Cowboy check your books
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