In a few days I'm going to look at a long range target rifle built on a Farquharson action. It's one of those rifles shot from a reclining position. The owner mentioned the caliber as a Gibbs proprietary cartridge but I forgot the bore diameter. It was above 40 caliber I believe. He indicated that he bought it at auction in England in the sixties. I know this is a shot in the dark, but are there any general guidelines as to what to look for? I know guns and can determine condition, etc., but I don't know much about the gunmakers who built rifles on Farquharson actions and I don't know which features might be valuable. My guess is that these reclining target guns are not as valuable as those rifles meant for hunting, all things being equal. But then I'm a hunter not a target shooter. I'll take photos and post them after the visit. Any advise offered will be appreciated. Please consider me a total novice in the Farquharson realm.
