Gary, not sure if exactly what twist is needed, but if this is of any help... We're running 225 TTSX 's in my wife's Win. Model 70. using RL 22. Getting decent accuracy (around 1 to 1 1/4 3-shot groups), and very good velocity 2950 (according to my Chrony). I hope that might have been of some use! Good Luck memtb
