HI,

I forget PC you are down under so no Dave Clay. The 1:26 twist I have was suppose to be for blackpowder with heavy bullets at low FPS up tp 2000fps,so the 1:22 would work better for smokeless when fps are over 2000fps. My 50-110 was one of the first Dave did, I have gone over 2150 fps with a 525 HC and it shoots fine with the 1:26, but Dave is using the 1:22 for the 50-110 now,Kev