Ofcorse.
More often than some realize when a revolver is built at the factory some variables are not really paid that close attention to which could lead to slight inaccuracy like the throat of the barrel, chamber size compared to the grove diameter of the barrel, slight misaligned chambers to the bore, & Crown.
In common with rifles and pistols, the barrel crown and leade (the "funnel" area just in front of the bullet seat which aligns the bullet to the bore) must be concentric with the barrel bore. Considering arms where the chamber is cut in the barrel, the leade is usually concentric. Not necessarily so with revolvers, for the leade is the barrel forcing cone, and it is seldom concentric with the bore and almost never with the chambers, unless the chambers are line-bored. The crowns of most factory guns are off a little.
When cylinder throats are undersize, they can be enlarged by reaming, lapping, or honing.
A revolver will almost always shoot more accurately when the barrel is recrowned and the forcing cone recut, assuming the work is done correctly and the cuts are concentric with the bore. Improperly done, the new cuts will simply follow the original with no improvement. The amount of improvement will depend upon how poor the original was, and how concentric the recuts are.
Essentially, the barrel throat is lengthened one and one half to two calibers, and enlarged to slightly over groove diameter. The throat serves as the throat in a rifle barrel, enabling the bullet to become perfectly aligned with the bore before engaging the rifling. The "choking" effect present from tightening the barrel into the frame is removed as well. The rifling leade is a very gentle 1 ½ degrees.
Statements in bold were derived from information from Alpha Precision, Inc.
