I just got a GAP10 6.5 creedmoor and looking for a good load for hunting/ target shooting. I order some factor Hornady 129 grain SST to shoot now but prefer to hand load.
For a long range load, I would start with the factory load: 41.5g H4350 under a 140 amax. You might play with different bullets, but a gas gun doesn't really lend itself to hotrodding the loads much.