Steve,
Yo dude.........
My main hog gun is a .375H&H I just got back from texas where I killed 3 hogs with a .470NE, I've also shot several with a .458Lott.
The .375H&H may well be the best all around hog gun on earth. It's got reach and it's got swat for close in range.
I've killed in the neighborhood of 5-600 hogs with a .375H&H and I've killed 5 with the .470 and probably 5 or so with the.458Lott.
I've also killed several hundred with .308's -.06's .300mags 30-30 45-70 etc.
This may surprise you a bit but. The heavies on hogs.........
If you don't hit major bone do not kill much faster faster than say a .308 behind the shoulder. If you do conect on sholder bone the heavies provide for some really spectacular knock down, slammer, jammer kills.
the heavies are also capable of penetrating all the way through any hog from any angle and they always exit which will leave a good blood trail.
The .375H&H will not always exit on a big hog...Much to the surprise of several H&H users I've had out on the ranch. I've had a smallish 250lb class boar stop a 300gr NPT on the off shoulder on a broadside shot. I've had a smaller 150lbs hog stop a 270gr X on a stem to stern shot.
These animals were all killed quite rapidly but it just gives you an idea of how tough hogs are.
Just a few days ago I shot a pretty good little boar with the .470NE he was running by at about 40 or 50 yards. At the shot he gave no indication of a hit whatsoever. In any case I reloaded the rifle and started to run up the hill to get another shot when he just fell over dead. I had hit him twice low behind the shoulder through the heart. This hog took two 500gr .475 x bullets through the heart and then ran nearly 100 yards before kicking the bucket. Heavies are fun to shoot hogs with but they are not death beams by any imagination, and if you don't hit a hog in the vitals even with a .470 or a .458 they run off quite nicely......
But by all means go ahead and hunt them with the .458 it's fun to do and it will build your skills with a heavy rifle like no other type of practice can.