Not Condusive To accuracy means just what it says....
The 2pc stock and the tiny receiver are problematic.
What is "accuracy"? Getting one tiny 3 shot group out of a day at the range, or shooting 10-15 5rd groups in a day which average out under .5"? Is accuracy something you can deliver offhand using maybe a sling? Do you load and test a variety of bullets, primers and powders to determine best outcome?
Pretty zany to do such load & component testing, unless you're shooting mild cast bullet loads which won't wear throat or rifling. Perhaps you're not really into shooting as much as making the rifle shoot??? It's a free country, but... You will note that there are no Ruger #1s ever fielded in any precision competitions. They're very handsome rifles, modelled on the Farquahr(sp?), but if you're happy with the lucky 3 shot group, the #1 is maybe all you need. Some of them are very elegant.
The Winchester Hi-Wall single shots were competitive in their day; rigged with a 20x Unertl or Lyman return to battery scope & mount. Awesome looking gear; just not "practical" or competitive any longer...
The 77gr smk match loaded .223/5.56x45 worked for the Army Marksmanship Unit in winning Service Rifle championships shooting the one load from 200-600yds. At 600, most competitors go 80 or 90gr single-loading for their better wind-bucking; but the AMU guys all shot mag-length loads 77gr and won! Pretty much 1moa to .5moa performance at all ranges to be in the top 10 matchwise. Of course, they were shooting 20" heavy barrels with open sights. How much better from a bipod or bagged position with a decent scope?
AR-15s with the right ammunition will shoot right with the best bolt rifles, yet the flat top receivers with built-in picatinny rail elimnate the base variables from being problematic. One thing to mount a varminting scope on a rail or barrel block, like on a #1; another to mount wholly on receiver or a properly torqued free-float tube...
Stock doesn't influence accuracy potential on an AR design. Radial bolt lugs are better than dual or triple lugs, Plenty of reasons the AR shoots better than most bolt rifles.
If you go with a .223 chambered varmint rifle, as noted the 12 or 14 twist won't handle any longrange capable (high bc) bullet. Do you buy the limitation? Do you want to be limited? One thing to be sure: the match bthp designs and vlds are NOT frangible! I have shot lots of my handloaded 75/77gr match into rock and gravel backdrop and they might bend like a pretzel, but they don't break up. Not good for neighborhood varminting. For that you want that 4k velocity 40gr hp; or maybe a 17cal hottie...
With Nosler partition and other 60+ grain premium bullets you have a good deer ctg. Admittedly, have to be sure of shot placment, but... the heavy bullets will take heavier game, again shot placement... Of course, if you can keep 10rds in 2" at 200yds in under 10sec, your placement ought to be pretty good. The .223 is very capable, but few have barrels or load to its capcity.
Regarding rifles... If your aim is consistent precision, you start with what the precision shooting winners are shooting and eliminate as many unknowns right from the start as you can. Look at Brownells catalog and see what customizing options are available for which platform. There is no market in trying to make a sow's ear shoot. You start with acknowledge accurate platforms and try to improve on them.... If you like to be eccentric, the Ruger #1 might be for you...