I bought a Browning Left handed A-bolt/Medallion in the .300 Win Mag 20+ years ago. Nothing have ever survived being down range when the trigger was pulled, out to 475 yards using Hand Loaded Nosler Partition 180 gr. bullets.
Not to rain on your favorite cartridge but I do not like nor will I shoot a belted magnum of any caliber.
Far too much recoil