Numbers don't lie...
There is truth to the good old "figures lie, and liars figure", and we all know that energy does not kill, and we all know that ergonomics influence perceived recoil, and we all know that nobody feels recoil on a game shot, and we all know etc. etc. but the bottom line is that numbers often do not lie...
Case in point:
- .375 300 gr @ 2,500 fps = 4,200 ft/lbs energy
- .458 500 gr @ 2,100 fps = 5,000 ft/lb energy
No, energy does not kill, but does a 20% increase in delivered energy make a difference when it comes to DG rifles? Not really in
killing power, the .375 will perfectly kill Buff and Elephant. But
stopping power is a very different thing, and the 20% increase in delivered energy makes a stunning (pun fully intended) difference in knock down power. Never mind the increased sectional area too...
- .375 300 gr @ 2,500 fps in 9 lbs rifle = 42 ft/lbs recoil
- .458 500 gr @ 2,100 fps in 9 lbs rifle = 65 ft/lbs recoil
No, you will not feel recoil when shooting at game, but does a 55% increase in delivered recoil make a difference? You bet it does! And often it translates in lesser accuracy due to poor recoil control...
But .458 Win remains very shootable with practice. Just do not shoot off the bench once the rifle is sighted; mount the scope as forward as possible away from your face, so that it does not cut you in hurried shooting; and shoot regularly.
This being said, bringing a .375 and .458 on a first safari is not what I would recommend. You will most likely hunt PG on that first hunt. Make one of these Zastava M70 a .300 Win Mag. As to the other, .375 or .458, it is all a matter of personal choice. Sure, the .375 is more versatile, but the .458 will do anything the .375 does on DG, and then a lot more if things turn nasty...
The traditional rationale is that the .375 has a flatter trajectory and can also be used on PG. While this is true, again numbers do not lie! Check ballistic charts: the .375 trajectory soon runs out of steam compared to a .300, and the .458 will still reach 200 yards easily when resting the horizontal crosshair on top of the Impala's back.
Which is best? This one is easy (not always the case): the one you really want
