Maybe this will help.
BTW how many manuals do you have and how many have specific 7.62 Nato data? I have several and not one has specific 7.62 Nato data. Lyman 48 is the only one I have that even lists the Nato round and they lump it in with their 308 data . Lyman lists it as follows:
308 WINCHESTER (7.62x51mm) (7.62 NATO). Other than this, the NATO round appears nowhere in any of my manuals or powder manufacturers data. NATO brass, you bet, reduce powder due to less case capacity, NATO data, Nothing.
Why? Why NO 7.62x51 NATO load data? There are more than a few rifles chambered in 7.62, so why no data? If the NATO chamber must be loaded down to such anemic pressures, then why no data?
The answer is simple, there is tons of data it's called 308 Winchester data.
I know, I know Hornady lists data for the 308 Win. Service Rifle, some will argue that this is 7.62 x 51 NATO specific, not so. If you read the first page of this data you see that it has nothing to do with the NATO chamber as it is not even mentioned. This data is rifle/action specific not chamber specific. Hornady also list the same reduced loads for the 30-06 Service Rifle, which is specific to the Garand.
Again, take a good look at this Cartridge Spec sheet.
It shows the much talked about NATO max pressure of 50K psi. Take the time to look closely at this load. 172gr bullet powered by 44gr IMR-4895 at 2640fps. It lists the M14 so I will assume a 22 inch barrel.
Now, gather all of your loading manuals and powder manufactures data and find a similar load.
Hornady #7 lists 165-168gr bullet(lighter and commercial brass) at 43.3gr IMR-4895 in the 308 Win. Less than the NATO spec sheet.
Speer #13 lists 165gr bullet (lighter bullet and commercial brass) at 43.0gr IMR-4895.
Lyman 48 Lists 168gr bullet (lighter bullet and commercial brass) at 42.5gr IMR-4895. They even list pressures at 51,200 CUP. Imagine that 50K CUP NOT 50K psi.
Sierra #5 lists 168gr bullet (lighter bullet commercial brass) at 41.3gr IMR-4895.
Nosler #6 lists 165-168gr bullet(lighter bullet commercial brass) at 43gr IMR-4895.
Hodgdon lists 168gr bullet at 45.4gr IMR-4895 with an MAP of 58K psi, not CUP.
What does it all mean. It means that according to the Military's own documents their 7.62 NATO round is hotter
than all 308 Win data.