Best current powder for 6.5G?

[Fess]

If I was shooting an AR I would favor TAC or X-Terminator. Lower cost, good performance and availability. For a target shooter which is a rare animal amongst Grendel shooters I want a short cut stick powder. 8208 has poor availability. N133 produces greater velocity.

FWIW, ancient Grendel History: "On March 6, 2006, Arne Brennan achieved a witnessed 1.198 inch 5 shot group at 660 yards using the Lapua 108 Scenar Projectile with N133 powder... no voodoo or black magic powder / bullets there."
It must be noted though, that Arne was using a custom bolt gun and running at well above SAAMI pressures.