That is a very nice clean example, those bores look about "as new".....you will be all set for Tiger and Asian Gaur!
The 440 grain bullet (cast 1:16) NfB load out of my .500 3" Ingram will shoot through a 1/4" mild steel plate......

The gunroom at Cogswell & Harrison are very happy to search their records and give you details. (for a price of course)
- Mike