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Betcha they’ve got reams of data compiled on .30 cal or .30-06 huh? Imagine that. Dust off those books boys! Probably a crapton of ammunition still.

Most if not all 30.06 has been sold off by the CMP over the years. .308 (7.62X51 NATO) is still in use by GPMG's so there's lots of data available.

Here's a link to an article comparing .264 USA, 5.56 NATO, and 7.62X51 NATO.

http://www.thefirearmblog.com/blog/2016/08/31/modern-intermediate-calibers-021-us-army-marksmanship-units-264-usa/

The .264 USA does better in every category. The .264 USA also weighs less per round (carry more) , and is shorter that 7.62 NATO (smaller lighter firearm. The 6.5mm bullets used in the .264 suffers less wind drift, shoots flatter, and has more retained energy at long distance than 7.62 NATO.

How different is the .264 USA and the 6.5x47 Lapua? I've been hunting for several years with the Lapua. I like it a lot.

I also have a 6.5Grendel. I'm very impressed with the 6.5 rounds.