Has anyone any experience with CFE223 in they're 22/250s ? Also my 22/250 has a 12"twist ,I was shooting Sierra's new 60gr TMK and got tight ideal groups at a 100yds. On the box its says 10"twist are faster. I wonder if these bullets will group well at 200+yards ? I guess testing is only way to find out. Loads will be for PD's in MT.