I collect all I can find going in gun/pawn shops while I travel around and newspaper/internet adds. I usually find a couple used Mk-5 rifles a year in the $550 range. I love the Mk-5 actions because you save a bunch on a trigger since the Weatherby is very nice. It is the best action to build the ultramags, Lapuas, 378/ 416 Rigby wildcats, etc. No feeding problems with that big magazine box when the Remmy's, etc. are stretching it to fit the ultramags. No problem opening up the bolt face for the big stuff. A custom action is nice also but pricey compared to what you can get the wby for. Mk-5 actions are incredibly strong and safe. I have had very good success with them through the years. I would say I have about 20-25 rifles built on them right now. Some of those are still the original rifles going back to when they were built in Germany.
Lost in Thought, Please send Search Party!