Just bought a gun on my bucket list a ruger old vaquero. Anyone know what the sights are set up for ? (45 LC)
My suspicion is the OP meant what distance are the sights regulated to. Which means how far out will the point be where the bullet trajectory crosses the sight picture.
In the old days, Colts were regulated quite far out. I forget exactly how far, but 200 yards is what I seem to remember. Sight regulation is controlled by how high the front sight is.
The bullet trajectory actually crosses the sight picture at two points, one fairly close in while the bullet is still rising, and one point much farther out after the bullet has started to descend. But at exactly what distance the trajectory crosses the sight picture depends on many things, including height of the front sight, amount of recoil, how the shooter holds the gun, and how much the shooter allows the gun to recoil.
If you look closely at that photo of my 'original model' Vaquero you will see that I flattened the front sight slightly with a file. I did this at the range, after carefully wrapping the muzzle with electricians tape to protect the barrel from the inevitable slips of the file. Every time I fired a group I would file a little bit off the top, then fire another group to see how much the point of impact moved. I probably repeated this process about ten times until I was satisfied with the result. However, it is pointless to do this with a fixed sight revolver if you have not settled on a load. Change loads, or change your shooting style, and the point of impact will probably change.
In truth, I have a couple of dozen single action revolvers now, and I have not filed down the front sight on any of them other than that old Vaquero. Just not worth the effort, for CAS all I do is aim at the lower half of the target and I always hit it.
P.S. take a close look at the front sight of my 4 3/4" Colt. At some point somebody welded a little bit of metal onto the top of the front sight to raise it a little bit. Done before I owned the gun.