I shoot a lot of black powder cartridge silhouette each year, in excess of 1,000 rounds. I've used a good deal of KIK as it was much cheaper than Swiss. I found that if I used the same weight charge of Swiss, KIK, Goex or the new Old Eynsford that the point of impact is the same. The secret is the weight of powder, not volume. It varies in density so equal volumes do not equal same weight by scales. If you weigh the Goex you are now shooting and then make a volume measurer that gives that weight of powder on scales then it should shoot the same.