Can't comment on the Tikka, but I have the Weatherby in .338. I've only had it to the range once, but with factory Federal loads (standard not premium), it shot about 1.5" at 100 yards with the wind blowing between 30 and 40 mph. The range master was certainly impressed, I know I was. This was the first time I had shot a .338, and as indicated, the conditions were less than ideal. I've since reloaded some test rounds, and when I have had a chance to check it out on a calm day, I'll let you know. All I can say is that the Weatherby is a real shooter.