Muddy, I manufacture and sell chamber tools that are designed to enhance accuracy, especially in guns with deep free bore. Based on customer input, most of my sales are going to Ruger, Remington, and Winchester owners (in that order). Their chamber quality has gone from bad to worse in most American made rifles. I think SAAMI has a lot to do with this. In some calibers, there's a host of ammo manufacturers, both domestic and foreign. Because foreign ammo makers don't subscribe to SAAMI, there are some pretty loose standards out there. As a firearms manufacturer, what do you do? You cut the free bore deeper so that foreign ammo will shoot. In addition, there's an occasional gun that leaves the factory "out of spec". For most hunters, they probably don't care about 1 MOA accuracy. For us perfectionists, "out of spec" conditions drive us nuts. Either way, deep free bore takes its toll on accuracy.
If you hand load, you can compensate for deep free bore by doing some basic things. Measure your chamber depth and don't trim your cases to SAAMI standards (the measurements in your reloading manual). Wait until they are .005 short of bottoming out. Load your bullets out to .010 from the lands. Increase your powder charge until "normal" velocity is achieved. This will bring things back to full velocity, best accuracy, and won't increase chamber pressures above SAAMI standards.
I have tested many Tikkas and found the chambers to be much tighter (free bore) than most American made guns. I'm sure there are exceptions but what about the Ruger #1's & 77's, Winchester 70's or the Remington 700's where all their chambers are cut too deep. Their "out of spec" guns are even worse. Check this web site:
http://www.cactustactical.com/reloading/reloading.html