Well I think they are correct. I only need to flow .002" to get a perfect seal. The grooves on my barrels are .310" so a .308 is very close. I used Remington Core-Lokts and they seems to be doing fine. I don't think thy are obdurating front to back as much as the metal is simply being forced side-ways into the grooves, but obviously it's filling. The Core-Lokts have a thicker jacket then some other 30 cal bullets, so I am guessing the flow is side-to side in the grooves. These groups could not be this good if the bullet was loose in the bore.

Nosler and Hornady bonded bullets may fill better, but as I said above, I doubt I could shoot any better than 1.5" or 1.75" at 100 yards with my old eyes. Even if the rifle was shooting 1/4 MOA I'd never know it. When I was young I has super good vision.

I am not young anymore.