Mark X actions (Also called Mark 10): The two below have been floating around my shop for some 30 years. New in box old stock, never had a barrel installed. One day I will think up something to do with them. Bottom action has aftermarket 375 H&H length bottom metal.

I have 5 more with barrels and stocks: 30-06, 300 Win Mag, 338 Win Mag, 375 H&H and a 458 Win Mag. The 338 has a Shilen barrel, the remainder are factory barreled.