@Viral_SIGness
I have never had the good fortune to use the .375 Ruger ( yet ) , but I have only heard good things about it . And therefore , I strongly endorse your choice .
I do however , wish to clear a few of your misconceptions about the .458 Winchester Magnum . Here is an excellent article on the calibre by the late Finn Aagaard , who was widely known for being as unbiased an arms author as they came .
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An HP White laboratory report in 1961 ( only five years after the introduction of the .458 Winchester Magnum ) chronographed the velocity of Winchester Super Speed 500 grain round nosed steel jacketed solid factory loads ( fired from a pre 64 Winchester Model 70 “ African “ which employed a 25 inch barrel ) as 2087 feet per second . During this time , the .458 Winchester Magnum factory loads ( offered by Winchester & Remington ) boasted an advertised velocity of 2130 feet per second . It must be borne in mind that the pre 64 Winchester Model 70 rifles ( in .458 Winchester Magnum ) employed a substantially long throat . This long throat was responsible for fair loss in velocity . In other .458 Winchester Magnum rifles of this era ( such as the Fabrique Nationale Mausers or my own custom Enfield Model 1917 action .458 Winchester Magnum ) , the chamber throat is / was far shorter . Which is why noticeably better velocities could be attained from them .
The .458 Winchester Magnum had a few unsavory things going against it , from the get go . Things which could easily be avoided . To begin with ( 1956 to 1972 ) , both Winchester and Remington were using ball powders in their factory ammunition . In a short Magnum case like the .458 Winchester Magnum’s , the ball powder had to be severely compressed in order to attain a velocity above 2040 feet per second . Now , ball powder is an extremely unsuitable powder for compressing . It conceals over time and forms solid clumps . In freshly manufactured factory ammunition , this was ( obviously not a problem ) . But in the case of ammunition which had been loaded and was sitting in storage for more than a year or two , the operator would usually experience ignition issues since some of the propellant would not get ignited . This is what led to the loss of velocity .
What Winchester & Remington should have done during this time , was switch to an extruded propellant immediately . Instead , they looked at the wrong solution . They ( from 1972 onwards ) reduced the powder charge in their .458 Winchester Magnum . If you look at Winchester and Remington catalogs from the year 1972 onwards , then you shall see that they suddenly began to advertise the velocity of their .458 Winchester Magnum factory loads as 2040 feet per second . This time , even freshly loaded factory ammunition was performing unimpressively .
There was another problem which the .458 Winchester Magnum had faced during the 1970s . During this time , Hornady was sourcing the .458 Winchester Magnum ( and .375 Holland & Holland Magnum ) bullets for both Winchester and Remington . Between 1963 and 1979 , Hornady had replaced the steel jackets of their full metal jacket bullets with a cupronickel jacket . As a result , the .458 Winchester Magnum full metal jacket solids ( be it in factory loads or hand loads ) received a horrible reputation for distorting when used against elephants or Cape buffaloes or Gaur or rhinoceroses
From 1980 to 1992 , Hornady briefly returned to using copper clad steel jackets on their full metal jacket bullets . Now , the penetration was greatly improved in hand loaded ammunition . But Winchester & Remington continued to use reduced charges of propellant in their .458 Winchester Magnum factory loaded ammunition , which led to continued reports of poor penetration and velocity .
From 1985 until the time when the company had permanently ceased operations , A Square used to load their .458 Winchester Magnum factory ammunition with 465 grain naval bronze monolithic solids . The advertised velocity was 2200 feet per second , but shelf life issues had became prevalent once once loaded ammunition were stored for more than three years .
From 1992 to 2005 , Federal began to offer their 500 grain Trophy Bonded Bear Claw soft nosed factory loads and their 500 grain Trophy Bonded Sledgehammer brass jacketed flat nosed factory loads with an advertised velocity of 2150 feet per second . When I originally authored my book in 1994 , I had actually trialed Federal’s Trophy Bonded line by firing this ammunition over a chronograph . The velocity was indeed 2139 feet per second . And I spoke quite highly of Federal’s .458 Winchester Magnum ammunition in my book . Unfortunately , the shelf life problems still existed in ammunition which had been stored for more than a few years . Currently , Federal advertises the velocity of their 500 grain Trophy Bonded Sledgehammer Solids as 1950 feet per second . This is far too low and unacceptable for dangerous game , based upon my experience . Their 500 grain Trophy Bonded Bear Claw soft nosed factory loads claim and advertised velocity of 2090 feet per second and I personally find this to be quite acceptable for hunting marauding Royal Bengal tigers , Asiatic leopards or Asian sloth bears .
In modern times , ammunition companies have come to realize that extruded propellants work far better in compressed loads than ball propellants . Nosler’s 500 grain Partition loading and Norma’s 500 grain Swift A Frame factory loads both boast an advertised velocity of 2100 feet per second . I have run the 500 grain Nosler Partition soft nosed factory loads through a chronograph . The actual velocity is indeed 2091 feet per second . Labor Fur Ballistik offers a 480 grain flat nosed tombac jacketed solid factory load , which boasts an advertised velocity of 2247 feet per second . I assure you that this ammunition will definitely NOT glance off an elephant’s skull or shoulder bone .
A final factor which must be borne in mind , is that not all .458 Winchester Magnum cases hold the same amount of propellant ( even though they look identical to one another outwardly ) . Remington cases held less propellant than Winchester cases , which in turn held less propellant than Federal cases , which in turn held less propellant than A Square cases . Based upon my personal hand loading experiences , I have personally found Nosler brass cases to be absolutely unsurpassed for the .458 Winchester Magnum .