John Olin had 5 or 6 factory engraved M54 Sporting Rifles with full length Mannlicher stocks made up for friends. They were all chambered for the 30GOV’T ‘06.
You ever seen one of them?
Not in person, pictures. Just Google ‘John Olin Winchester Model 54 Mannlicher’. Leroy Merz sold one of the guns on Guns International and another was sold at Amoeskag Auction.