If one is looking for extreme caffeination, there are brands like (all appropriately named) Devil Mountain, Death Wish, High Voltage, Black Insomnia, etc.. Most of them far exceed the recommended 400mg daily dose in just one cup.
By a large factor....
Black Rifle is not one of them. The guys at Black Rifle do a great job of roasting their coffee and the beans are of the quality growers of Brazil and Colombia. Besides the beans, the roasting process and the roaster is a BIG factor in how coffee tastes.
I usually buy organic coffee from Whole Foods and have tried just about every brand they have over the decade. Black Rifle was good enough to make me drink it and prefer over others.
Why coffee roasting matters.
https://craftsense.co/coffee/why-cof...hs%20of%20time.