Actually, the U.S. Government tested the .300 Savage cartridge and, from the information I've read, they were ready to approve it's adoption as the standard U.S. cartridge to replace the .30/06 when they decided to "improve" it.
The "improvement" became known as the 7.62 NATO round aka the Winchester .308 cartridge.
Thus, you might say our Government used "existing technology"... sorta.... in a "left-handed" way... kinda. :-D
Strength & Honor...
Ron T.