The twist is 1 in 8" so you can run 140 VLDs and it will still shoot great if you go with the various 123s. The bbl length we usually use is 26" to 28"but we have done 24" bbls for guys that were going to shoot 123s. All the rifles we have built were Sporters with #3 or #4 contours, fluted to keep them light. We live and hunt in the mountains in Utah, big steep mountains so weight is a big factor for our customers. We even have our own Titanium muzzle brakes to use and sell to help keep the weight down. Good luck with your build !! ------ RHB