Thank you very much.
So you have alot of double rifles.LOL....so you will need a gunbearer, so you can hunt with the .58 and have the .72 as stopping rifle.

Very interesting the picture of both kinds of rear sights.
I see the the rear sights of the .72 are canted, this can leads to a different vertical point of impact for each barrel. Please, remember this when shooting. I hade this problem with my Kodiak.
I think that a little canting on back sight can be used to correct vertical POI. JMHO--

Enjoy your rifles and post your experiences.
Thanks
Martin