I recently had a similar dilemma. I wanted a .22 centerfire on a 0.378" boltface. My initial choice was the .222 Rem & a 1-12" twist, but a few years ago Kansas made .22 centerfires legal for deer hunting. So I changed my cartridge choice to .222 Rem Mag for the additional velocity and ordered a Lilja 6 groove 1-10" barrel so I could shoot heavier bullets. I don't envision ever using this rifle for long range target work, so won't be shooting the 70-80 grainers which need more spin.
