I fired a .577 Nitro. Once. Lovely rifle and a privilege to shoot, but...when one shot makes your teeth hurt, it's too much of a good thing...
Now a .50-70 or .50-90 might be interesting. Make bigger holes in the critters. I'm afeared my first shots with a .50-140 would have some amount of cream of wheat in the case...
I've had a couple of 500 and 577 NE rifles for Africa. I even had a 600 NE double by Verney Carron at one time, but it was way too heavy to carry for Elephant hunting, and I sold it before I hunted with it. I would think with a Galco pad on the butt and 130gr of FFG, the mighty 50-140 might just be manageable :-)
You don't load 50-140's down ,you load them up 146 grs Fg with a 570 gr ppb unless you got a tight twist and can use the heavy bullets. They shoot,it takes awhile to learn what makes them tick . These days I full length size mine to reduce the powder capacity to 146 grs when you just neck size them some brands of brass will hold 160+ grs. Some things in life you only need to experience once in a 10 lb 3 oz rifle. Magnum Man
Biebs, I didn't say without no compression . With Fg GOEX I use approx. .33-.38" depending on how thick a grease cookie I think I need to keep my fouling moist for the conditions I'm dealing with. Some are happy with a boom, I like it when it's cracking and dragon blood in the case mouth with good groups. AND NO these are not MOA loads but work for for as far as I shoot on living animals with irons. Was I to use a 50 on big African game it would be twisted tighter than mine is for 650 to 700 gr bullets. 38" drop tube packs the powder fine. MM
Got it. A 45-70 would certainly handle a Plains Game hunt anyway.
Yup, just ask sharpsguy. You can see part of one of his Africa hunt videos here;
Ed
"Not in an open forum, where truth has less value than opinions, where all opinions are equally welcome regardless of their origins, rationale, inanity, or truth, where opinions are neither of equal value nor decisive." Ken Howell
You can see part of one of his Africa hunt videos here; 
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