hits, and ONLY brain or luck hits to spine or shoulder can reliably stop a charge. Having TWICE as many such hits is the only intelligent way to go. John Wayne is not going to be there for you. So much for the lever action and dangerous game.
Bzzzzt. Wrong answer.
Vince Lupo took all of the African dangerous game with a Marlin 1895 and Garrett Hammerheads (superhardcast lead with very wide meplats) without trouble. .30 cals are too light to reliably stop such game. In fact it's illegal to hunt dangerous game with anything less than a .375 H&H.
no, they were a waste of money, once reliable auto rifles were available.
4x at the brain, on a MOVING 6" circle, is a LOT better bet. If you bozos weren't so LAZY, you'd set up such a mover, and KNOW how unlikely it is to get such a hit in 1-2 tries, in that time frame. Buff and bears hit 50 fps, lion's charge at nearly 90 fps. So the 20m charge, even from a standing start, is at most a tad under 2 seconds. You bozos probably couldn't get off ONE good shot in such a time frame, starting from low ready, but a truly good rifleman, with an auto rifle, can get off 3-4 such shots, in such a time frame.
It ain't the rifle, its the bullet with its greater weight and heavier construction along with sufficient velocity bud. Fast firing is fine but you have to have enough penetration to wreck the little motor inside the animal that makes it go. Go back and study up. You may return when you can discuss intelligently.
You'll have time for ONE, maybe TWO shots at typical charge distance. Doesn't matter what your rifle's action is. The double rifle is superior to the sutoloader for these hunts because autoloaders can and do jam. You don't want this happening with a black rhino in your face. If the first shot from the double rifle doesn't do it (or is a dud), trigger the other barrel.
BTW, African hunts are guided, and you will have a "boy" to carry a second rifle should you so choose.