An 8x68S case necked up, or .375 Ruger necked up could also be considered, even if the .8x68S was shortened to 2.5" or 2.6". It would still have increased capacity over the .458 WM. and with a 40 degree shoulder, more enough for proper headspace. None hand loaders need not apply.

Sounds like some new wildcats to me. LOL

I'd make them up for Jose L. in Spain, if I had a Ruger .375 - hmmmmm - might know just where to get one!