| The reason for limiting a .30/06's 150 grain bullet to 2700 fps was to keep recoil down for inexperienced draftee soldiers who were complaining about the kick. The Garand was designed for ammunition loaded with 172 grain bullets, but those had to be discontinued because of the range limitations on some National Guard ranges. The 172 grain ammo was too long-ranged and often escaped the shorter National Guard ranges, causing complaints among the populace. All this is according to General Hatcher's "Book of the Garand". Hatcher was in charge of the Springfield Armory and was the Ordnance Corp at the time of the adoption of the Garand. The 150 grain load was basically a reduced load that was safe for the range parameters at that time.
150 grain .30/06 can be loaded to 3100fps safely in a good bolt action rifle, but that overworks the operating rod of the Garand rifle, quickly putting them out of service. | 
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