I've made many 22 CH II with a 7mm08 die then a 243 win die to a 22 CH II fl die. It's way too much work! My last three guns are fed Laupa 243 Win cases necked to 22 cal. I have a .250 nk gun and a .256 neck gun. You have to neck turn the .250 chamber but not on the .256 chamber. My 9 twist gun loves 65 Sierra game kings with VV N560, 3800 fps, and the 14 twist gun loves 55 Sierra Blitzkings with RL 15, 4050 fps. I moly coat all my bullets. In case your interested, I have about 200 new 308 UBR Rem brass.