Thanks to information posted by Michael Courtney, I decided to try 69g SMK's in my 12 twist 22-250. Hodgdon load data showed 3499 fps mv from a 24" barrel using Superformance with a 70g bullet, so I used that data for my workup. I chose the 40.2g load, which produced a .445" group @ 100 yards and averaged 3579 fps from a 26" barrel. I can't wait to stretch the range with this load and see what it can do! I have also prepared some test loads with RL-17, but didn't have time to shoot them. Attached are images of my load workup and my rifle.