I'd say the .458 is one of those " fair cartridges " . Those who dislike it , dislike it with a passion. Those who like it , find it " fair " . There's a book written by one of my favorite fire arms experts , Mike LaGrange . It's called " Ballistics in Perspective " . In it , he mentions that the .458 Win Mag is uses by far , by the most professional cullers. But he goes on to say that while it gets the job done , it is far from the most ideal cartridge for the job.
When my Granddad went to Kenya in '68 for his Safari ( where he dropped a bull elephant with a shoulder shot using the .375 HH Magnum which l own now ) , he observed that all the PHs there were armed with Winchester Model 70 rifles in either .375 HH Magnum or .458 Win Mag. But he also reports that MANY people were unsatisfied with the cartridge and it's lack of penetration . This prompted many PHs to use a .375HH Magnum for all their DG hunting.
This is corroborated by the Hunter , Harry Manners who also thought very poorly of the .458 Win Mag. You can find a 4 part video on you tube of a man who went on a safari with Harry in the 1960s . In the video , he reports 5 shots from a .458 being needed to put down a Bull Elephant.
Now , on the other side of the spectrum b, you have Harry Selby , who actually sold his infamous .416 Rigby and used a .458 Model 70 towards the end of his hunting career and was very happy with it.
Me , personally ... I had the good fortune to hunt a brown bear with a. 458 Win Mag in 2010 . It was an Original BRNO ZKK602 belonging to my childhood friend , Evan ( ironically , that's the gun that got me loving the BRNO actions so much ) . The gun couldn't feed soft point ammunition reliablyely , but with a solid FMJ , it completely pole axed that huge bear. Of course , bears don't even come close to African elephant or buffalo.
Update. I got some information wrong. Harry Selby never actually replaced his .416 Rigby with a .458 Winchester Model 70 . He merely used the .458 Model 70 for TWO years while his .416 Rigby was being rebarrelled in London by Rigby. And the only reason he chose a .458 Win Mag was because that .458 Win Mag rifle was his Safari Outfit 's spare back up up rifle and rental rifle. Another hunter named Mr. Brian Marsh used the same .458 Win Mag rifle as his back up rifle when he was working in Harry Selby's Safari outfitters because At the time , non citizens on work permits were prohibited from importing rifles in Botswana .
Source : Man Magnum 2016.
It is commonly agreed by many professional hunters that the biggest reasons why the .458 Winchester Magnum was ever popular was because of the following reasons :
1) It came out at a time when Kynoch had just discontinued every single centre fire cartridge , rendering the English big bore doubles ( and the few big bore Magazine rifles at the time , like .404 , .416 and .505 ) essentially useless. The only British cartridge still being produced was the .375 HH Magnum ( because it was non proprietary ) . So the .458 Winchester Magnum was all that was available at the time
2) Game laws had just recently started stipulating that hunters couldn't use calibers less than .375 HH Magnum for Dangerous game . So , if you factor in the first reason , a Hunter's only choices would be confined to a .375 HH Magnum and a .458 Winchester Magnum. Despite this , MANY hunters like Harry Manners and Wally Johnson stuck with their .375s.
Wally's son , Walter used to own a .458 Win Mag for a brief time , but swapped it for a .458 Lott after the Lott Came out.
3) This is a reason that didn't hit me until recently : Back in those days , it was customary that when the client hunter was going home , he would leave his surplus ammo to the Professional Hunter if their weapon calibers were similar. Back in those days ( late 50s to early 70s ) , virtually every American client hunter used to bring a .458 Winchester Magnum rifle and spare ammunition to Africa. So it made sense for some PHs to have a spare .458 Win Mag lying around camp even if they didn't use it .
Till now , the only famous PHs l know of who actually used a .458 win mag exclusively , are :
Finn Aagaard ( a Winchester Model 70 and a rebarrelled Westley Richards )
Mike Cameron ( Winchester Model 70)
Donnie Jan Bredenkamp ( .458 Mannlicher )
W Middleton Lofty Stokes ( .458 Mannlicher ).
A lot of PHs had .458 win Mags but backed them up with heavier double rifles in the era .
A lot of them had one lying around camp for the client to use but preferred something else themselves.