Well, I finally bought a 209 ignition system for my older knight wolverine. And I guess it is right what they say. I used to get 2" groups with 95gr of pyrodex and 240gr XTP. Now with the 209, I am getting 4" at 100 yards. I tried powerbelts, 240gr XTP, 250gr Knight barnes, and combination with 100gr of pellets, 90 to 110gr of loose pyrodex, 90 to 110gr of goex with all bullets. I guess its right that with a hotter primer accuracy can suffer.