I just shot 200 rounds over the weekend
Shot heavy loads in my Ruger. I used Shooter's Choice bullets which have a dry lube almost like teflon. Barrel looked almost like it had been cleaned after I was done.
Some of the guys here said the residue is more from the lube than the powder. Don't know, but I do know that when I shoot bullets with the softer lube and Unique that the barrel on my 45 acp is a mess in short order. I was using H-110 in the Ruger