I use Blue Bullets in my CZ SP01 Shadow with 125gn bullet, 3.8gn N320 @ 1.115. 20,000 + no leading, no smoke. I also use the Blue Bullets in my CZ Czechmate open gun. 125gn Bule Bullet 7.1gn N350 @ 1.155 in 8,000 rounds I have cleaned the comp 4 times. Coated bullets do not work well in open guns that have popple holes in the barrel.