I'm looking to build a 10/22 to fill several purposes, open competition, fun, and maybe a little vermin thining. I've already got my fun gun 10/22 but I'd like a 22lr that can say to hell with tacks and drive pins. So I've got a few questions I'd like others to weigh in on. I want to develop the build around 2 particular factory loads, all high-velocity from CCI so my first question is this, what is the optimum twist rate and length of a bull barrel for a 22lr bullet traveling between 1200 and 1450 fps? The three CCI loads are the following: Velocitor 40 grain CPHP 1435fps @ muzzle AR Tactical 40 grain CPRN 1200fps @ muzzle Select 40 grain LRN (this is just in case there's a shortage on AR Tactical, they're mirror image rounds by the looks of it save the copper plating) Excluding human error the barrel and ammo match are the heart of accuracy in a rifle, so I figure its a good place to start. So can anyone give me any information or suggestions on good barrels and the length and twists?