H4831, lots of it. I ended up using a case full. You can get some amazing velocities, 3030 fps. That was on a chrongraph using the old printed paper screens that had to be broken, so , a long time ago. Anyway it was in a standard throat Remington 721. I am sure pressures were high but, I never had any trouble with classic pressure signs. That was before I knew about measuring case web expansion. Accuracy was inch and a half-ish at 100 yards. For real accuracy it liked 4064 and the Speer 100 grain hollowpoints. Work up slowly and be carefull.

I second the H4831sc. My Roberts loves 47 gr over CCI200 primers. Not max, but gives outstanding accuracy. Re19 and Re22 are also excellent choices.

Mine seems to like 45 grains of IMR4350. Gives great accuracy no real pressure signs in my Win. FW. Different strokes I guess.>John