AZguy- the .416 Taylor is a good choice due to it's ballistics, easy of making brass, easy loading - ie: great performance with minimal ampunt of powder/recoil.
: Most factory .416 Rigby's probably run about 2,400fps or a bit less with factory ammo, with 400gr. bullets. The .416 Taylor runs exactly the same velocities & with sane, safe pressures in African heat. It worked perfectly even before better powders were developed. That makes it an even better choice today.
: Factory ammo - yeah - I shoot a lot of it, but only in rimfires.
: Many guys are all wound up on cavernous ctgs. that develope the lowest pressures possible (originally designed due to cordite and it's volitility in heat) then put the rounds in bolt action rifles that are safe and sane with pressurs over 60,000PSI. They then absorb 50% more recoil than they need to, recoil that takes their eyes off the animal being shot, and think they've got the world by the ball.
: The little 2.5" case will do it all. No need for 3" cases and actions as long as your forearm.
: Of course, that just my opinion.