I used a CZ 550 Safari Magnum in 458 Winchester Magnum on my recent African Safari. I didn't chronograph it, but the 500 grain Woodleigh softs and solids shot through the same ragged hole at 100 yards, using 73/71 grains of 2206 (not sure what the equivalent is).

A 41" Cape Buffalo died with one solid through the chest, and 7 other animals from Klipspringer to Giraffe also died.

There is not a thing in the world wrong with the 458 with modern components.

I love mine and will be taking it back to Africa next time.

CF