Outstanding post
@Slamfire thank you!
I don’t know of any competition from rest, with 22 pistol, either. This may be why there is so little information on what a great or match type accuracy group should be.
I anticipate that I will shoot some groups at 25y similar to your 50y example. One ragged hole with one or two rounds outside the ragged hole.
I can't hold a rimfire pistol well enough to get anywhere near the inherent accuracy of the pistol, nor its ammunition. I think I can, at times, with a rifle.
With a rifle, ammunition is the limiting factor for accuracy (assuming you dobe the wind perfectly, which is far from a given). Serious rifle shooters lot test all the time, and both Eley and Lapua have indoor shooting ranges at which you can have your rifle lot tested. I am going to say it makes a difference, my lot tested Lapua always produces the highest X counts when I do my part correctly. Lets say lot tested match rimfire groups around 12 to 15 mm at 50 yards. About a dime sized thing. Very tight compared to a pistol. "Good" cheap ammunition will group around an inch to 1.25 at 50 yards. Not accurate enough for a rifle match, but fine for a pistol.
I give the Bullseye shooters grief when I see them shooting Eley Red Box, price from
https://www.killoughshootingsports.com/107-eley-ammunition is $1875 a case, before shipping! The limiting factor in Bullseye Pistol shooting is the human. The ten ring is around 3.5 inch.
Sometimes nothing sane you can do will make it go bang, or cycle the slide. That's a score killer.
I am of the opinion that reliability is more important than inherent accuracy, for ammunition used in rimfire Bullseye pistol competitions. I will also say, the more expensive stuff, the real "Pistol Match" is very reliable and very consistent compared to over the counter ammunition. So, you have a trade off, $10.00 a hundred for cheap stuff, or $37.00 for one hundred rounds of the good stuff.
When I talked to Killough Shooting Sports about accuracy out of a pistol, they said that pistol groups will be at least twice as large as a rifle with good match ammunition.
In my opinion, get off the bench and learn to shoot a pistol offhand. The National Forests do not have 600 lb concrete benches every 50 yards so Bench Rest shooters can shoot at game, with sandbags and a rest.