Sir Bob,
I enjoyed P3 of your blog on the Single shot Big Bores. I've never had a Ruger #1 in .458 but I did in little brother 338WM. I held two rounds between the fingers of my left hand on the forearm and one between the second and third fingers of my shooting hand. I always wear very light leather gloves and had grooves in them and my fingers I think for a few years. No problem reloading the #1 in 2.5 seconds for the second shot while leaving the butt on my shoulder. I would just lower the barrel as I hit the lever sending the brass either over my shoulder or it would hit me in the shoulder, and dropped the single out of the trigger handle in the hole and sweep the lever back as the bore came back up. I wasn't hunting charging buffalo but fleeing Elk so there's that but as you mentioned in your Blog; never had a failure to eject, load or fire with the old #1.
dmw