The velocity of most standard or traditional muzzleloaders does not support using the heaviest of bullets on African game. The energy is just not there. That said the Remington XML and many other custom muzzleloaders using bullets 300 plus or minus grains at 2400 or more FPS will get the job done at reasonable range. Even custom muzzleloader makers that have been around for 250 years by me swear by 45 caliber traditional muzzleloaders because the velocity energy and bullet drop over distance is far improved from the 50 or 54s. And the fact is most 50s shoot 45 caliber bullets. Barnes made the bullets for the Remington XML and of course they have proven themselves in Africa.
The 45 cal and 50 cal are the most popular all around do all calibers. The 40 cal and 54 cal are probably the second most popular calibers. The 40 cal for deer and small game and the 54 cal for deer, boar, bears, elk, and moose. The 36 cal and the 58 calclose third most popular. The 36 cal for small game and the 58 cal by those that want something bigger than a 45, 50, 54 cal for NA big game and a separate small game rifle in 30 to 40 cal.
And the fact is most 50s shoot 45 caliber bullets.
Please clarify....as it depends on how tight the bore is cut, depends on how thick the patch to ball diameter is needed.
2 Ball sizes for the .50 cal: .490 and .495. For proper fit a .010 to .015 patch for the .490 dia ball and For the .495 ball a .010 patch does the job. As the rifling wears down though years of shooting a thicker patch is used.
Buffalo and cast bullets don't require patching as they are bore size.
Those that shoot sabots, usually modern inline shooters, are using a .44 cal (.429 or .430 dia.) or .45 cal. (.451 dia.) bullet depending on the thickness of the plastic sabot.
.45 cal muzzleloaders use .440 or .445 diameter ball using the same standard thicknesses of patching, .010 or .015.
The velocity of most standard or traditional muzzleloaders does not support using the heaviest of bullets on African game. The energy is just not there.
The velocity and energy of the maxi ball and the better Buffalo bullet, has been killing deer, black bear, grizzly bear, elk, moose, and pretty much every other big game North American big game for over 200 years. Making both .45 cal and the .50 cal rifles perfectly suitable for PG and DG, with exception of elephant, in Africa.
....300 plus or minus grains at 2400 or more FPS will get the job done at reasonable range.
Now I'm going to have to chronograph my hunting loads. Something I have never done. I doubt if my muzzle velocities out of my Hawkens rifles using a 70 grain volume weight charge of FFFg exceeds 1700 to 1800 fps range.
My comfort limit is 100 yards using iron sights.