Exactly!!IMO having worked in a couple firearms mfg'rs , doing several hundred of anything you build a drill jig..especially when they are going to be attached to a part (GripFrame) that has little variance.
(Welder, Machinist, Fabricator, 46yrs)
In my opinion, If WBR would have found it cheaper for the grip vendor to install the medallions he would have had them do that. If WBR would have found it cheaper for the medallion holes to be installed at the Ruger factory and then installed, he would have done that. WBR definitely counted his pennies when it came to production costs.The answer would have been simple enough for Ruger at the time. Have them made by others but don’t install the Ruger medallions on the ivory or stag grips. Identify them as Ruger on the back of the grips. The guns already had the Ruger logo. Just a beautiful set of unadulterated natural grips to enhance your flattop.
They had the same technology then. Heck, they had the same technology in the 1800's, except on steam powered drilling equipment probably. Its not like doing grip holes was CNC technology.And its likely with todays technology those holes would be part of the manufacturing process!