Two words:
Robertson Composite.
They make a tactical for the Tikka.
I looked at buying a Tikka ways back but the factory stock really wasn't to my liking. Robertson Composites came out with a stock for Tikka rifles a bit afterwards.
A buddy of mine had a 338LM with one of the Robertson Composite stocks (was going to order the same thing but now live in an area where I wouldn't get any real use from that cartridge). When he took the rifle parts in we were able to compare the RC stock with a Macmillian side by side. The RC stock was nicer, and less expensive. Plus you can get it customized to your preferences.
I don't own any of these stocks at this time, but if I were to want/need a new stock this would be the route I would look into.