This might sound ignorant but I don't think the 90s and up are built for the big case .224 cartridges. The .223 with fast twist barrels shoot them very well. Slow down the velocities and they do great. Unfortunately that's not the way most of us are wired. Speed is always where it's at with most of us. I mean speed but tuned down for accuracy. Nobody wants a 22-250 Ackley running 90s at 2700 fps. What's the point ? I settled on an 8 twist .22-250 Ackley after shooting various .224 cartridges. Those high RPM's and bullet jackets do not mix. Running an 8 twist with 75/80s is the best of all worlds for me. Fast, accurate and dependable. Not being a competition shooter, I always say a bullet that blows up only costs me a coyote or ground hog. Not the match. Still, I prefer all my bullets on target.