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Try using Rooster Jacket lube on your cast bullets. It is similar to Lee Liquid Alox, but it smokes a lot less (and I think you cannot push it as hard)

I loaded some .38 Specials with 125 grain truncated cone cast bullets for shooting in a bullseye league. They did really well when loaded near the top end of the load data, and no leading or smoke. Then some other shooters asked me to tone them down a little and the accuracy completely fell apart when I loaded them lighter. (not sure what this means, I think the bullet design just didn't stablized at low velocity, or didn't obterate enough, or maybe I just suck when I use that box of ammo) But anyway, at about 900 fps they were almost like shooting FMJ bullets but a lot cheaper.