I have had good results using TightGroup in .223 Rem. with cast bullets at rim fire velocity. I also have a single shot 7.62X39 Remington Spartan that shoots well with cast heavier bullets at deer hunting velocities. Ideally I'd like to carry that Spartan with both heavy deer loads and small game loads when hunting. The scope for the Spartan has a vertical crosshair with a line of dots on it that would work well for 2 different loads. The .223 load with a 60 grain cast bullet uses 3.0 grains TiteGroup for 1160 fps. I'd like to utilize this powder for light loads in 7.62X39 Data is sketchy using Titegroup in the 7.62X39. I have only found one load on the net with a 150 gr. bullet and 8.0 grains TiteGroup with a velocity of 1100 fps. I have cast a bunch of the Lee TL314-90-SWC bullets in my Lyman #2 clone alloy.