Interesting read. Good luck with that. Can’t imagine any practical advantage in such a canon, but I look forward to the report (probably hear it from hereIt has worked pretty well for 100 or so guys that have the B&M family of wildcats. From plains game to all the way to elephants. The whole series of cartridges have been designed to be able to use shorter barreled rifles that perform while using standard length Win. model 70 actions with CRF. As mentioned above it provides about 20% more muzzle energy than a .375 H&H. BTW, the rifle with a wood stock is about 7.5 - 8lbs without a scope so very handy "to be lugging around".
You can find more info about the cartridge here:
https://www.b-mriflesandcartridges.com/458-B-M.html
