Good trade, IMO. If you hadn't shot the pistol much in 14 years, it was just taking up space.
I wouldn't be in too big of a hurry to trash the scope and mounts, there are collectors who will pay for those old parts. The Leupold may actually be worth a couple hundred $. Advertise them on Auction Arms of GunsAmerica.
If you decide you don't want a 308 Norma Mag and beong forced into reloading, it should not be a big deal to open up the chamber and remark the barrel to 300 Win Mag if the magazine can take the .090" longer cartridge.