Thank you for those figures. RL22 should be quite close to MRP, as they're made at the same plant, with the same specification or 'recipe'.
Velocity aside, I was quite pleased with the results. I only made 5 cartridges with this one load. One shot is 'missing' due to chronograph testing. 100 m / 110 yds. 22 mm / 0.85in group.