Well, I have a pound of IMR 4831 and 4350, so I'll have to start on a load soon. I may try some R-22, and I have a few factory loads I want to chronograph.
I just bought five boxes of Federal Premium HE 140gr Trophy Bonded .280 loads from Midway (at $13/box!), and they list a 3150 muzzle velocity on the box. Hornady Light Mag 139gr bullets chrono'd 3050 out of my 22" Mountain Rifle, so I would expect similar results out of the Federal ammo.