That's a fine looking rifle for sure. The .458 is a kicker from what I have heard. I have never shot one but I take everyone's word for it.
I have shot my son's CZ 375 H&H, which is not bad at all. Actually, the felt recoil is less than my .338 Win Mag. The 375 is so accurate that I suggested when he first got it a few years ago, that we take it groundhog hunting just for the fun of it. My son was first man on the gun and took a groundhog at 116 yards. I even got the shot on video. It was classic.
Now, go have some fun with that big boomer.