Most people use it because it works. Seriously though, I have had 3 different 260 barrels, all by different manufacturers, 1 was an 8 twist and the other 2 were 9 twist and it didn't seem to matter to the load. Just dump 36 grains behind a 107 or 140 and you are ready to compete. Mild recoil and sub MOA accuracy - what more can you ask out of a powder.