I've never held between fingers. I can imagine that anything bigger than a .303 would be awkward. They are front-heavy, wobbly, dangly things, that want to go everywhere but where you want them, even when not pulling ridiculous tricks such as mentioned, unless they are on your belt. Secondly, I don't want my fingers at the forend to feel any disturbance or awkwardness when sighting for a shot, it's not natural. The first reason above is why I never liked the .450 no. 2, because the long things were so fumbly. I've mentioned this before, that I found myself wanting a different rifle for this reason ONLY.
I'll never use another as long as I live. I still see that morning sometimes, and it was surreal. Surreal, in that I was still standing there and still ok when I should not have been ok at all. Something with a 3" case size is better to hold on to and direct into the chambers, much like a shotgun shell. Yes, belt on strong side, right hand. There really is no way around this unless totally switching to a magazine rifle.