Why do I get the feeling that somebody's missed the boat here, like apples and oranges?
When I think single shot rifles, I'm thinking Ruger #1's, Browning B78 and B85 or a Dakota #10. Wish like hell I could afford a #10)
I agree there are single shot bolt action rifles but I have to wonder if that was on the OP's mind or was he thinking Ruger#1 and that ilk? Somehow I think not.
I can't speak of the accuracy of a Dakota #10 as I've only seen one and was not privileged to even hold it. Guy complained that it wasn't accurate but I'm thinking it wasn't the rifle.
I haven't shot a Browning B85 but I do have a B78 in 30-06 and accuracy is quite good. I haven't to do anything to tune it at all and as Murphy says, "If it ain't broke, don't fix it."
Ruger #1's I can comment on as I have quite a few. I was collecting them for a while till the prices got, I felt, a bit out of line. I have them running in various formats chambered to .22 Hornet all the way up to .416 Rigby. All mine are the "red pad" models and all probably have those sometimes good and sometimes lousy Wilson contract barrels. Ruger's black pad models have barrels made by Ruger and I hear they're very good.
I have noticed that most of the "B" models with smaller bores all seem to shoot quite well. Once the ones I have get larger bores (30 cal. and larger) accuracy was a sometimes thing. Only one smaller bore rifle has given me fits. A "B" model in 25-06 (I have two). One I bought cheap to use as a donor for a custom .35 Whelen shot so well I decided to leave it be. Found another at a gun show that was so pristine it could almost pass for NIB. Anyone ever see a .25 caliber shotgun. It's been set aside for further work.
I have three #1's in .300 Win. Mag., one a "B" model and two in the "S" configuration. All three shoot in the sub-MOA category.
One I have is a "V" model in .223 Rem. and it shoots in the .3's.
Several in the "A" model shoot decent ranging from .75" to 1.5", all more than suitable for hunting.
If you get the impression I like the Ruger #1, well you're quite right. I like them very much. They have their idiosyncrasies but that just make them and life interesting. Besides, I like the challenge of hunting with a single loader.
Paul B.