CJF,
Both rifles are very nice, and you can be proud of them. I remember your quest for scope mounts, you were very lucky to have found some; I hope you are able to have an appropriate scope fitted. I wouldn't be as eager to use a "period" scope as one with clear optics and a useable reticle. I am a little concerned about the Lapua bullets you have ordered. Their products are very high quality, that is not my concern at all. I just believe those bullets would be more appropriate for 9.3x57-9.3x62- 9.3x74R-9.3x64 class cartridges. The Tesco style bullets currently loaded in factory 9.3x72R ammo are made to be safe for use in barrels of different groove diameters. Buffalo Arms has a bullet for 9.3x72R that seems to have been formed from 200 grain 35 Rem. bullets, therefore would be appropriate for the 9.3x72R velocity. In rifles with .358" barrels, the 35 Rem. bullets would work as they are, the new "Flex Tip" bullets should be great.

Themauserkid,
The part of the above concerning bullets may apply to your rifle, depending on the groove diameter. The Tesco style bullets mentioned above would be useable in about all 9.3x72R rifles and are still made (I believe) by RWS, Norma, and Sellier& Bellot. They may be difficult to find, but that is expected when working with these rifles. It was recently announced that an American company has bought Sellier& Bellot, which would likely make their products more easily available. Also, cast bullets are a good choice for regular use, considering the current cost of most bullets. It is important that proof marks for both rifles be posted. Rifles of this quality were possibly (maybe probably) "express proofed", which could be important because double rifles are more difficult to find a load for, that the bullets impact together.
Mike