I haven't met a Tikka yet that couldn't be made to shoot great. That being said, some can get temperamental about ammo, action torque settings, and whether or not the stock is slightly touching the barrel 2-4 inches from the receiver.
My 223 shoots everything extremely well EXCEPT 75 or 80 grain A-Maxes. This is incredibly bizarre because I have never heard of a gun, with proper twist, that didn't like A-Maxes. Maybe it was my powder choice. It is just a quirk with the gun. Since it shoots Bergers to 800yds under half moa, I haven't worried too much about it.
As for an accurate stock, I would stay away from the B&C. We had one here that we planned on testing, but the craftsmanship and inlet design were so horrible that we decided to not change damaging one of our rifles.
Hunters seem to love them. This makes sense since most hunters don't put thousands of rounds of ammo through their guns each year and are typically looking for minute of deer accuracy to around 300 yards. There is NOTHING wrong with this. It is simply something I have observed.
The aftermarket stocks we have seen the best accuracy with are the Helmick Arms, GRS, and XLR systems. For looks and adjustability you can't beat the GRS. If tactical is what you are after the XLR is hard to beat.
More info can be found here: http://www.tikkaperformance.com/Tikka%20T3%20Aftermarket/Tikka%20T3%20Aftermarket%20Stock
All of these have an oversized recoil lug built into the stock for added rigidity.
Hope this helps!