I agree that the MK series work extremely well- but I've never met one that didn't have a trigger pull that made me irritated: too gritty/heavy, with annoying break characterisitics.
The Buckmark Camper, out of the box, feels like a MK series after plopping down another $200 in trigger parts and then paying a 'smith to make the upgrades.
Yet, both of them pale by comparison to the more 'competition/target' oriented pistols, like the High Standards, S&W 41s, or Colt Match Targets. Or, the rarified area of the Pardini's and other $1400+ competition .22 pistols.
However, the more expensive they are, the more tweaking to 'dial them in'.
I would say the Ruger MK series is like a Mustang or Camero, while the S&W 41 is like a Corvette, the High Standards are like a precision Italian car from the 60s that had to have its carbs tuned every 6 months, and the Pardini's are like Formula 1 cars.
Which is a better design? It depends on what you are trying to accomplish and what your skill levels are.
That said, the MK Series is definitely a solid performer, and they DO go 'bang' every time, and they are more accurate than 80% of the shooters I know can capitalize on.
My wife loves the 22/45 I have set up for her- but my MK series have no original parts inside the grip frame except the MSH/latch assembly.
Ammo...
Is your competition really a MK I, with the 9 round magazine? Cool!
Yet, from what you described, you have a ruger angled pistol, that is no longer a Ruger. Accuracy comes from barrel/bolt alignment coupled with feed reliability and trigger smoothness. If the barrel and bolt are no longer Ruger, and the trigger/hammer components are no longer Ruger, then it isn't really 'Ruger' that is making it so accurate.
I am no putting down your accomplishments at the line with it. Yet, we also have to acknowledge that some of this could be more about your ability compared to your neighbors ability at the line.
I have embarrassed some people at my local range when I was firing a $550 RIA 1911 and regularly getting 50 rounds into a fist-sized hole at 10 yards, when the people in question had trouble keeping 10 rounds in a 12" circle at the same distance, and they had $1500 1911s in the same caliber. One of them, after seeing what I was shooting, said I should be in a commercial for RIA.
I smiled, packed up and left. I didn't feel like explaining that I could probably have the same results, or better, with their 1911s- and that their results would not be much different on my RIA.
Yet, it IS satisfying when some firearm 'snob' looks down their nose at our choice at the beginning, and then we mop the floor with them. I get that!
Pete2- The Ruger revolvers are good solid plinkers, but you are right- the .22lr round out of a single six isn't going to be as accurate as out of a classic S&W or Colt revolver.
That is partially because the Single-Six uses a barrel optimized for the .22mag round, which is a thousandths or two larger than the .22lr.
A Single-Six in .22Mag has more accuracy/precision potential than in .22lr, due to the barrel diameter.
I have not personally fired the S&W or Colt .22lr revolvers enough to have a preference- but I envy those who have them and get a chance to use them often.
They are elegant revolvers with great potential.