I personally love the idea of a fast twist 22-250 or even the 243 too... But I just think that for 308 case sizes like 6 Creed/243/22-250, it's probably more powder that what I'm looking for. That's less barrel life, more blast, etc... And from a 18" barrel, I would think they are pretty damn close to the GT cartridges in terms of velocity. It really is between 22 ARC and 22 GT. But I've got 22 ARC alpha brass sitting in my shopping cart, haha. Just finishing up a different Tikka build and then I can allocate some money towards this project
I do have a soft spot for the 22-250. I left a lot of meat chunks in the prairie dog towns growing up in Wyoming. That paid big dividends by time I joined the Marines, hitting 3-foot wide paper targets with iron signs at 500 yards was pretty straight forward after you've been hitting little prairie dogs at 300-400 yards.