Ruger MK series is what I shoot in competition. Are they the most accurate? Dunno. But they are sure tough to beat. The only thing not modified on my guns is the barrel... We've set a few in Ransom Rests and shot some very impressive groups @50yds with them. We didn't have a Hammerli, Buckmark, or Smith that could come close to them with the ammo we had on hand. The Buckmark, Smith41, Hammerli, Pardini, Morini, Beretta, Farwinkbaur,TOZx, Colt Woodsman/Diamondback, High Standard, and Volquartsen barrels round out the rest of the herd by shooting the found sweet spot ammo for any one of them to target group sizes that amaze. What gun shoots the most different brands, velocitiy, lube/wax coating and such the best? In my eyes, the Ruger. The Smith41 was designed to shoot the CCI Standard Velocity Target ammo. It shoots them quite well, along with 'some' other rimfire ammo. But not all. The Hammerli's shoot most Ely Primed ammo well. There are a few companies that offer rimfire conversions for 1911 stylle pistols that are often used in competition, but are also very well suited for 'sporting'/'plinking'. Kimber and Marvel come to mind. I've shot a couple, and they shoot very well. Why did I mention brands of guns, (not models), that are most often refered to as competition versions? Because a quick change of the grips, and many of them become that sporting model or plinker in an instant.
-Steve