I have been around cattle all my life and I know how they react and how dangerous they can be if underestimated. I agree with all you related and echo that I use what I can shoot with most accuracy. I use 454 Casull in my 5-inch muzzle-brake equipped 460 S&W to mitigate bullet-pull prone to occur with this round when shot in lighter revolvers. And I shoot 500 JRH because a 440 grain hard cast bullet at 1400 fps in my 6.5 inch half-lug barrel length X-frame is much more controllable than the 500 S&W magnum. And by using the shorter case-length, bullet-pull tie-up is also mitigated. I do not hand load yet but a PUNCH bullet would be my pick too. Ultra reliable bullet construction integrity would be the result.
Go with God and God Bless You for being a sane voice of experience when using revolvers for hunting BIG game.