Yes, appears they are possibly, mixing the Distinguish Match with service/duty revolver match. This match limited to 4" or below bbl. I was wrong here,
3.6 Stock Service Revolver: A factory
manufactured (catalog item) revolver capable of
chambering and firing ".38 Special" ammunition.
1. Barrel length up to 4 inches.
2. The front sight being a ramp or post as sold
by the manufacturer of the firearm.
3. Replacement of service type sights with
other service type sights, luminescent
service sights, or fiber optic service sights,
provided such sights do not require
alteration of the firearm for installation.
4. Chamfered cylinders.
.38 special ammo only.
However-Open Revolver match
Open Class Revolver: A revolver chambered to
fire center-fire cartridges "_32 Caliber or larger"
the trigger is capable of single action it must be
capable of lifting 2.5 pounds when the gun is
cocked for single action firing.
1. Maximum barrel length of 6 inches.
2. Maximum sight radius 8.5 inches.
3. Sight guards may not extend rearward more
than 2 inches.
So, if you wanted to use a .45 in the open revolver should be no problem.