The only Match rifle I have left is a very low end Anshutz 2000 (from the 60's when Savage was the importer) and it has a 22" barrel. shoots great at 50 yards.
When I had a 54 Action Prone rifle from 1972 it had a 24" barrel, as did my Kimber Clackamas Government model.
The Kimber of Oregon varmint model is just as good as the Target rifles has a 20.
Most guns when built got for as long of barrel as possible, but the barrel profile/diameter is adjusted to make a total specific weight class (including scope weight). All current Anshutz Target barrels are 24", the made a series of 20" with same diameters in the late 90's but that was a short-lived project. Just remember, Anshutz only make target rifles (many are of Olympic quality) but they don't use Bench Rest specifications, so they look at barrels differently, and make them with a 3" choke (that's the larger outside diameter at the muzzle). They bore, then rifle, then turn the outside profile to get the choke. The constriction is about .0004"
Rugar makes hammer forged barrels; they have a bore that is tapered by .0005" tighter at the muzzle (usually 20") when the hammer forge operator does it correctly (most of the time).
BTW, How do you plan on scoping an early Model 52? Drilling and tapping the action is a difficult endeavor with the original flat for the rear sight. Many feel that tapping mounts like the old Redfield blocks messes with the barrel harmonics. It is a real risk on those pre-war guns! The Remington 37's and 700's used a different steel to avoid that problem.
Ivan