for what its worth,
@Riflecrank and
@Badboymelvin are the two 458 win apologists. that said, i am drinking that cool-aid as well. apparently you can drive a 400 gr bullet to 2500 fps in a 458 win. i only get 2400 fps in mine, but, that is 416 rigby/remington velocity.
recoil is not bad, and with the hammer bullets i am using, i would not hesitate to shoot to 300 yards on plains game. out to 200 yards is a hold on spot and shoot. a 375 is a more versatile cartridge, but the 458 is no slouch.
good luck with your choice.