Not sure where you are looking for 416 Rigby ammo but Midway has hornady DGX, Barnes TSX, Federal swift A frame, and federal trophy bonded bear claws in stock.DGX has worked perfectly for me for buffalo, albeit with another chambering.
1 shot kill - .416 Rigby
My rifle shot DGX and DGS to the same POI, so I carried some of both, just in case.
My rifle, a CZ 550, was a less accurate with factory TSX, so I didn't use them. Barnes ammo was much harder to find, so I took that into consideration also.
I just looked, and they still don't have it!
4 years and counting...
My PH was a big fan of Swift A-Frames.The Federal swift a frames are available on their website.
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Buy Safari Swift A-Frame, 375 H&H Magnum, 300 Grain, Swift A-Frame, 2450 fps Ammo | Federal
Shopping for the Safari Swift A-Frame, 375 H&H Magnum, 300 Grain, Swift A-Frame, 2450 fps - Learn more about the latest Safari Swift A-Frame and other hunting or shooting gear at Federal Ammunition.www.federalpremium.com
This is an easy one. TSX all the way. With TSX there is no need for solids for buffaloIn 375H&H, what would be your choice of 300gr bullet manufactured cartridges for heavy game, in particular Buffalo, but also Eland or Sable: Duo DGX/DGS or TSX?
Note that A-Frame is out of scope, impossible to find any Federal apart Power-Shok...