HS are wonderfully accurate pistols. The issues are basically standard velocity ammo which is minor and finding good magazines which is more of a problem. The big advantage of the Ruger MK series is you don't have to deal with either issue.
For me, particularly since a balance issue due to a brain tumor means I'm never going to be worth a flip as a bullseye shooter, means my old HS went away and I bought a Ruger. The Ruger is considerably more accurate than I'm capable of. Also I don't feel badly about carrying the Ruger around for use as a field gun.
If you have the ability to really shoot well, get a HS or a S&W41. A 41 will cost more but magazines are easier to deal with. Personally I think a good HS is slightly more accurate than the 41 and the HS always felt better in my hands which is highly subjective.
As for the Buckmark, I think they are in the same class as the Ruger. That makes them pretty good pistols for the price. Again highly subjective but the Ruger feels better in my hands.
So if you're really serious about accuracy go w the HS or the 41. Pick whichever feels better to you. If you just want a pretty good 22 semi to have fun with, either the Ruger or the Buckmark will serve you well. Finally for what it's worth, I actually shoot my 6" M617 better than my Ruger. The Ruger is just more convenient for plinking being magazine fed.
Accuracy wise the Rugers will still shoot better than anyone other than a truly distinguished shooter. However, even as an average shooter, I still score about 10 more points per match with a High Standard Victor than I do with my Ruger Mk I 678 Target (and I shoot it better than my Mk II 512 Target).
As for the accuracy of the High Standard Victor, these are five shot groups of CCI standard velocity fired at 50' shot with a Victor and a 2x scope with my hand resting on a bag for zeroing purposes. I'm still the limiting factor:
Offhand, single hand I shoot like this:
So while I do a bit better with the better trigger on the Victor, any of the pistols in this thread are probably more accurate than any of the shooters in this thread when it comes to single hand offhand bullseye shooting.
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Magazines for the High Standard are harder to find and they'll cost you about $55 when you find them. Inerarmstx.com is your best source. They make quality magazines that fit both the newer and older Victors very well.
I do however recommend you also spend $45 or so on a magazine adjustment tool. Half the old High Standard and newer Interarmstx magazines I have purchased have needed some minor feed lip adjustment to function reliably in both my Hamden marked Victors. The original HS magazines feed a bit smoother but the Interarmstx magazines are well made, reliable and have lips that are thick enough and hard enough to stay in tune over time, as long as you don't drop them on the feed lips.
The feed lip adjustment is critical as the High Standard pistols do not have a feed ramp, so the bullet has to feed from the magazine at the right angle to have the bullet enter the chamber. If the bullet sits to high in the magazine, it'll impact the barrel above the chamber. Too low and it'll either impact the barrel below the feed ramp, or in a less severe too low condition, shave some lead off the bullet on the way in the chamber. I've noted the bullet needs to sit slightly higher in the magazinze with the Interarmstx magazines than in the original HS magazines to feed reliably.
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Ruger magazines are about half as expensive and the factory Ruger magazines hold up well. But I've also had older magazines come out of tune as well.
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FWIW, the Kimber 1911 .22 LR and CZ Kadet magazines are the best .22 LR magazines I have found. They are durable and relentlessly reliable.
