I chronographed Federal HST 124 +P, Hornady Critical Duty 135 +P, and Speer Gold Dot 124 through a Boberg XR9s, Kahr PM9, and a Kimber Solo. The PM9 was 5 to 10 fps slower and the Solo was about 30 to 40 fps slower than the Boberg. I think that they use fast burning powders in these self defense loads to keep the flash down. Anyway the longer barrel really did not give the extra performance I expected or Boberg advertises. I talked to Arne on this and he is aware that many common self defense loads perform this way.