I'm definitely not one of those Weatherby "nut-swingers" that think velocity trumps all; but the 6.8 SPC with 130gr bullets is severely lacking in it for medium size and large game IMO; so much so that most monolithic bullets probably wouldn't even open at 200 yards. If I did hunt with 6.8spc, it would be with 110 grain bullets at 2700fps, but considering that a 25-06 will do 3300 FPS with the same weight bullet, you have to wonder why anyone would limit themselves by using the 6.8spc for hunting.
And you mentioned AR platform; be mindful that you won't be able to take that to Africa.
The dilemma when hunting Africa, is that you might be out hunting for a Baboon and run into a trophy Kudu. You might be out in the bush with your 6.8SPC looking for a duiker, and run across a massive waterbuck at 200 yards. You may think you are going out every morning hunting 1 animal like we do in the US and Europe, but that is not the case in Africa; Every time you step off the bakie with your rifle, you are potentially hunting many different animals between 30 pounds and 2,000 pounds. That is why a versatile cartridge like 7mm/308/30-06/300 mag is so coveted for plains game hunting, and why most consider the .270win to be a minimum.
May 2020, will be my third trip to South Africa. This third trip is for hippo, eland and gemsbuck. For these three animals I'll be using my .375 H&H, with 300 grain softs and solids, (and/or my .458 Win Mag, with 500 grain softs/ solids, for hippo).
The 6.8 SPC is for SPECIFIC GAME. AS OTHER, if any, animal(s) BIGGER THAN BLESBUCK on my list WOULD HAVE ALREADY BEEN KILLED USING 30-06, .375 H&H, or .458WM.
My 6.8 SPC, 130 grain Hornady SST loads have a velocity of +/- 2250 fps, BC 0.460, SD 0.242, bullet diameter 0.277. At 100 yards, out of a 15 inch barrel pistol mounted with 2-10(?) x 32(?), Simmons pistol scope, 10 rds, 2-2 1/2 inch groups.
BALLISTICS: from ballistic calculator:
@100 yds: velocity: 2057 fps
energy: 1221 ft lbs
@200 yds: velocity: 1892 fps
energy: 1033 ft lbs
@300 yds: velocity: 1736 fps
energy: 870 ft lbs
Hornady recommends a minimum of 1800 fps for proper bullet function.
The concept is to minimize damage to a hide(s) for full body mount(s).
Yet know I have enough gun for the job.
Killing paper is one thing, humanely and quickly killing an animal is something else. Having no first hand experience as to what this caliber and bullet is fully capable of killing or what kind of exit hole/damage to light skin game it can do. Thus, why I created the original posts.