I have the exact same rifle except mine is not a SL, it's a T3 lite. The barrel is not flutted. Right out of the box mine has been a 1/2"-3/4" rifle. Have been seeing these Tikkas shooting in local matches in the factory class for about 4 years. They generally shoot better than any other gun. Triggers are good and never have seen one malfunction in any way. Have seen full magazines drop off a bench onto concrete floors with no damage. Plastic may be ugly, but it is tough.
The factory rings a junk. Replaced mine with Talley LW's

I have several rifles and could basically have used anything I want for this years elk hunt. Took the T3 lite .300 and it worked perfectly in temperatures down to -24.

Elk didn't like it much.

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LC