cayugad I have played a little with the BH just as you did. I found that when I swabbed my Pro Hunter my groups were wide open at 100 yards, but much better when I didn't swab. That was with 120 gr of BH and TMZ in 290 gr. I tried the same test in my Mountaineer and found a little different result with 120 gr of BH and 300 gr Lehigh with a orange sabot, when swabbing I was consistently high 4 inches and about an inch to the left plus my group was closer to an 1 3/4. With the same load on a fouled barrel, one shot, with the same load, I was 2 inches high a 100 and less than inch group. This is how I wanted the gun sighted in so I did not touch it. I have found that about the 3 or 4th shot the loading gets pretty hard to get the bullet started but after that initial couple of inches, it is still tight but smooth on down to the charge.