I've got a Mark V in 416 Weatherby that I've had for roughly 17 years. There are those that don't like them as stated above. However I find it to my liking, the recoil is stiff but it's not unmanagable. It takes practice to get used to any firearm. Personally I don't find the recoil any worse than any other large bore rifle.

A friend has a Mark V in 378, this rifle has a harder snap than my 416 but it's still managable. I've never shot the 460, but it can't be much worse than my 416. Years ago the factory ammo was loaded a little hotter for the 460, advertised ME was 8400. Current factory load is 7500. These are very nice rifles, but like anything else isn't for everyone.

If you are a handloader of course you can download the 416 WM to 416 Rigby ballistics or 458 WM in the case of the 460.

Cheers,
Sam