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Close but incorrect with that muzzle brake.
It started out as a Magnum Research BFR chambered most likely in 500 magnum, there's a few viable conversion calibers it could be.

It was converted over to 500 Bushwacker by TII (T2) Armory.
500 Bushwacker is functionally an elephant hunting round, and has an upper energy limit of 5,000 foot pounds.
For reference 500 magnum has an upper energy limit of 3,000 ft⋅lbf, and 45-70 has an upper limit of 3,450 ft⋅lbf if memory serves.

I could be wrong, but that would mean someone stuck a TII Armory muzzle brake meant for 500 Bushwacker on a lesser cartridge for no reason whatsoever.

Muzzle break is to protect your wrist.

I shoot them out of a Marlin model 1895 lever action rifle.