Don't know bout AR10 load yet. I have a Predator AR10 in 308. Shoots one hole with Fed match 168s.
But my favorite bolt round is the 260 rem.
43.00 grains of H4350. Have a Panda with 29" Bartlein 5R 8 twist. PTG match chamber throated for 140 grain Berger Hybrids. Work done by Bartlein. Have a Ruger Precision that was a 6.5 Credemore. Had Greg at Southern Precision make a Bartlein 28.5" 260 barrel for it. 5r 8-twist. Greg used same reamer as Panda. Both guns shoot same load. Throats are .004" different. I was originally loading the Hybrids into lands. Ran some tests. Now Load the Hybrids .030 off lands. 2952 fps from Lab Radar. Zero pressure signs. Both guns shoot like particle weapons. The Panda has the edge but the Ruger is just a joy to shoot. I keep a spare 30" Bartlein Barrel here for next 260.
Been thinking bout a 6.5/300 SAUM or a PRC but I'm at 3000 fps from my 260s.
Next AR10 will be a 260 Rem. Not a 6 or 6.5 Credemore.
Going to build one for deer next.[/QUOTE
You got me interested in a ar10 ,260 now. Love my bolt 260 rem I just finished finally an ar 10 6. 5 Creedmore , but the 260 sounds .great