Patrick, my son has been shooting the Tikka T3 varmint model (heavy barrel) in 223 that I cut down to 17" shooting suppressed. It's an 8" twist barrel and shoots up to 75/77 grain bullets very well, mag fed. It is a great shooting rifle, and fun to shoot. He shot it in the Hunters Challenge match last year and did very well with it. We were running a 65 grain Sierra Game King, and it shot that load about 1/2 moa. If you want to take it and shoot it, let me know.