I'd call it a Service grade.
Keep in mind that the S&W and most all other revolvers EXCEPT the old Colt action models like the Python, Detective Special, etc do not lock the cylinder tightly when the trigger is pulled.
Most revolvers like the S&W, Ruger, Dan Wesson, and the later Colt models like the Mark III and later are designed to allow the cylinder to have some rotational movement.
The action design cannot lock the cylinder tightly like the old Colt "Bank Vault" action does when the trigger is pulled and held back.
Holding the trigger back in a S&W or these other brands is NOT a valid test for anything since the cylinder has free rotational movement by design.
The rotational movement of the cylinders on most brands is to allow the bullet passing from the chamber to the bore to force the chamber into alignment with the bore.
Only the old Colt action locks the cylinder tightly in alignment when the trigger is pulled.
The up side to the old Colt action was slightly better accuracy since the bullet entered the bore centered and didn't pick up any deformation.
The down side was a more expensive action to build, requiring a lot of hand labor by highly trained workers.
The S&W and other brands disadvantage is slightly less accuracy since the bullet hits the forcing cone slightly off center and causes slight bullet deformation, which causes some loss of accuracy.
The up side to these actions are, they're a lot cheaper to build because they require less highly trained personnel to build them.
The range rod seems to be more valuable in the older Colt's because the tightly locked cylinder will quickly reveal any misalignment.
In a S&W or other brands which are designed with built in back lash and cylinder rotational movement the action would need to be Match conditioned to warrant using a Match range rod.
Since very few of these other brands are ever giving such Match conditioning, and there aren't a lot of Master pistolsmiths who even know how to Match condition them, the uses of a Service range rod makes more sense.
So, if you own a S&W or other brand designed to allow cylinder movement a Service range rod is probably the best choice.
If you own an older Colt model you might get good use from a Match rod if you're trying to get the maximum accuracy out of the gun, and you know how to tune the old Colt action to get perfect alignment and timing.
