Ballistics of the .276/.256 M1 Rifle

[Clancy]

Gentlemen,
During the late 1920's Ordnance was working on the Caliber for the new Semiautomatic Rifle. Their study into the main Ballistics of the .276 and .256 Cal. cause Ordnance to Order TWO (2) things that Ordnance wanted from these round. These were in the Ballistics field. Any body know what Ordnance had in mind that MUST be part of the TWO NEW Rounds ?? TIA

Some data has been posted before others have not.

Thanks again
Clancy

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[Clancy]

Gentlemen,
As you all know that the Cailber .276 was to be 140gr bullet at 2600fps. Ordnance stated that a new .256 Cal. could also be made for the Garand Rifle. In 1927 the following was stated in Ordnance file.
"This weight of bullet is judged to be the mimimun practicable for a military cartridge of calibre less then .30 "BOTH the .276 and .256 were to be the same Ballistics.
Thanks again
Clancy
ps but then Ordnance stated the 125 grn. Ordnance then adopted the 30.06 which we all know about.