I like a 458 to weigh about 8.5lbs. I also like them with no scope. My 2 current ones, a M98 and a M70 pusher both are 8.5lbs near even. I think the 458win is a dream at this weigh with the normal load of a 500 at 2000. The newer hot factory loads start to make it feel a bit "light". My favorite was the old A-Square 480gr load in the M70.

I had a ZKK 458 rechambered to 3" Bell cases made up as a light weight rain forest Elephant gun. At 8lbs and pushing a 500 at 2300 it was a real big handful for me.