Chuck

Without rehearsing the obvious, as your rifle is already .375 it would be more economical to stay with the .532 bolt face of the .470 Capstick than to have to have further work done to open up to the .500 Jeffery rim, that said the work is none to difficult for an experienced riflemaker nor is it difficult to get the short fat .500 cases to feed, it just takes time and plenty of patience.

I Had a similar conversion myself some years ago and having ensured the rifle will feed with both soft and solids from both sides of the magazine reliably at the conversion stage I have not had any issues since.

I have no experience with the Capstick round but can say that using the same case size and having a Lott conversion would be a good way forward, it will do all you need, is available in more factory loadings than previousoly ( and than is the Capstick), is so close in performance terms to the capstick (on paper) that I seriously doubt you, or the animal would notice the difference on impact.

You would also, depending on the action / magazine box in use, gain the extra capacity in the magazine of the smaller diameter case. My own .500. like those made by Leonard for Jeffery holds but 3 rounds in the magazine, when it used the .532 diameter cases it held 4 in the magazine, possibly of little consequence to you but stil nice to have that extra capacity, especially for use in Africa. Of course there is an argument that if 3 rounds of .500 don't settle matters then you are in deep s**t, true enough.

The choice at the end of the day is yours, I love my rifle now it is a 500 Jeffery, then again I liked the 458 Lott, both are great stoppers.

Just my 2 cents.

jonathan