I've use many powders in the .32-20 with cast bullets of 90 - 117 grs. in weight. Best powder for accuracy has been Unique, but it's never worked well in my powder measure. I'm out of Unique and I'll buy no more even if it becomes easy to find again. I'll do load development with some other powder like 231 or something similar. Accuracy is more important to me than other considerations. No real need to use jacketed bulets in this cartridge, though they will work.