Varget.
This was one of those rare cases where just by chance I started load development with Varget. It shot well. In fact it shot the freaking lights out.
But I couldn't resist. I mean, you can't just stop at the first load, can you? So I kept going. 4895, AA2230, etc, etc, etc, I went through multiple loadings of about 4 additional powders, only to show that the Varget powder was the best.
Just as an aside can I again profess my everlasting love for the Tikka? My father bought one in .22-250 and after one bench session with test loads and one little twist of the allen wrench to adjust the trigger, that little honey was producing 5 shot groups at 100 that I can cover with a nickel. Compare that to the bad old days! Oh the money and time we spent on trigger jobs and endless test loads trying to get the same performance out of other rifles. I'm not going to start a flame war here by mentioning brands, but safe to say that the Tikka is the most incredible value that I can envision as far as out-of-the box accuracy.
Grouse