Re: most accurate out of the box factory rifle?
Out of the box - Considering value for $ here in New Zealand the Tikka T3 is very hard to go past. Being SS synthetic and including rings in the box it is the same price or cheaper than any silmilarly spected rifle available in the country. As far as throwing a scope on and shooting a rifle sub MOA with medium quality factory ammo I have yet to see one fail to perform. They have an excellent adjustable trigger, ridged synthetic stock, smooth bolt, and light weight. The magazine can be seen as a plus or minus depending on the shooter. I have four (.223 Rem with 1:8", 243 Win, 308Win and 7mmRM). All will shoot less than 1MOA with factory ammo. All will shoot under 0.5MOA with good handloads. The 7mmRM will deliver 0.3 MOA with Hornady Superformance 162 SST's every time I do my bit.
I have also had good experience with Savage over the years, but they are ugly and usually weigh more than the T3's. All of the Remingtons bar a .204 also shot fairly well, but usually require work to catch the T3 i.e. bedding, lug truing, fussy with ammo, etc.
As the original request was " out of the box" T3's get my vote. Going by the various posts in shooting forums here in New Zealand and turnover in a few local gun shops, I'm guessing that more than a third of the new rifles sold here are Tikka T3's and you rarely hear any negative feedback.