Of my current rifles, I would have to say that my M700P chambered in .308 Win. This rifle is the one I shoot accurately, most consistently. My best groups measured 0.75" at 300 yards (benched w/ handloads). My other heavy barreled rifles are equally accurate, but I don't shoot them this accurately, as-consistently-as my M700P. That said, all of my heavy barreled rifles will always strike 3.5", AR500 steel discs at 300 yards (benched w/ handloads). Those rifles include:
.308 Win M700P
.308 Win M70 Stealth
.308 Win Kimber LPT
.223 Rem M700V
.223 Rem Vanguard VS
Geno