Light loads of clays under light loads of shot give excellent results in target loads for 12ga, but I have had best results with Trailboss
for cartridge. Started with Trailboss, tried just about everything else, and wound up back where I started. EZ, accurate, and consistant, at least in the calibers i shoot: 44wcf 45 colt 45 schofield. A case filling powder designed for plinking. I will admit clays is cleaner, but a little soot on my cases isn't a big deal.