Shooting Cast Bullets
I have been shooting 240gr semiwadcutters with 10gr of unique out of my 44mag for 15 or more years. Always been dirty, always been smokey. I always thought it was the unique. But I have tried HP-38, and bullseye out of 38special. And still get the smoke and dirt.
Some tell me its the lube on the cast. Not the powder. I never shoot slow powders due to leading, but is it the lube?