New 416 Rigby ammo and cases are avaliable now.Not many years ago, you had to use old berdan cases or turn the belt off 460 or 378 Weatherby.Also larger actions were needed.This is what caused the interest in the other 416s using common brass and in some cases standard length actions.The funny thing is,this renewed interest in 416s seems to have brought the Rigby back to life.It's all good.BTW, any of them should make a good deer cartridge with a cast bullet at 1400-1500fps.
Mike