How is calling Dave Kiff going to get specs for a chamber when you have no idea what version reamer was used?
Kiff does not do reamers for all of the shops and I know for sure Surgeon uses a ton of JGS reamers. There are many "off the shelf" versions of .308 Match reamers available and probably 100 more that individual shops spec for their own needs.
If the reamer was custom spec'd by a shop or other customer, the reamer manufacturer will not share the info unless the owner of the print gives permission. So, your only reliable way of getting any info is from Surgeon.
Many "match" reamers out there like 95' Palma and Bisley have some inherent dimensions that can and do cause issues on duty or heavy use field rifles. Accordingly, many shops like Surgeon and KMW that have figured this out the hard way, have gone back and drawn up hybrid dimensions that give the best of both worlds.
Knowing how the typical Surgeon Scalpel shoots, I would load to factory length and go work on your shooting skills because the rifle is going to shoot small anyway.
TC