I bought some of the Winchester hyper velocity ammo (1435 FPS) and tried it in the Tikka. Set up a target at 25 yards and 75 yards and shot off front and rear bags. Accuracy was not good. At 75 yards I’d get 3 rounds real tight and two real bad flyers. It was worse than Thunderbolts, which shot 1.5” groups at 75 yards. Scope was set on 14 power. This won’t be my go-to ammo.