Have to admit that Rich is right....
It's kind of an apples and oranges comparison when you compare Weatherby's Mark V to other American actions, such as the Remington and Winchester.
Weatherby roots started with european actions. In Europe they have always had real medium actions. Remember that Roy was never into the short cartridge thing. The 6 lug was born out of the necessity to have a smaller, lighter rifle platform that could shoot 30-06 size cartridges and such will never be able to handle the standard 2.85" HH cartridges like the long magnum versions of a Winchester and Remington can. Roy designed the famous overbuilt Mark V 9 lug to handle the Big boys.
Decades ago, I remember most hunters talked of short, medium and long action rifles and cartridges. This was probably because of the large influx of cheap war surplus firearms and ammunition that flooded the US market and these rifles were "sporterized" by local gunsmiths. Many of these old rifles fell into the true medium action category.
So, in reality, a Weatherby Mark V 6 lug is a true medium action. Definitely not a short action but it can't handle the big magnum calibers either. I believe a Tikka is very much like this too...