I have a 17-6 given me about 1993. It prefers Federal brand over all others, and some of the others are so inaccurate that the margin is wide.
I have read and heard that computerized machining (CNC) produces specifications tighter to the standard than most machinists can produce. Consequently, CNC-machined guns are often more accurate than their predecessors.
Modern guns may not have the fine finish and smooth action of hand-worked guns of yesteryear, but their tolerances are tighter.
Or so I've read and heard.
Plenty of people on here would dispute that.
But it seems to make sense with my 17-6, which was CNC-made I'm told.
With my 59-year-old eyes, from a benchrest and good Federal ammo, it will put 6 shots into an inch.
An old-time gunsmith smoothed the action and reduced the single-action trigger pull to about 3 pounds. This aids accuracy tremendously.
I'm certain it shoots tighter than what I get from it.
It's my favorite .22 pistol. Roaming the remote Utah desert where I live, I carry it in a 1970s Safariland shoulder holster. It's well protected, doesn't snag on brush and readily accessible.
I also have a Smith & Wesson Model 14-8 that is CNC-machined. Limited testing indicates it is very accurate. Its action needs smoothing, and the single-action trigger pull reduced from about 6 to 3 or 4 pounds.
Very precise machining promotes accuracy.