mawla,
there are those that have had the problem, and those that will.
using them in a 458 on elk, black bear, and possibly kodiak bear, (i don't know the size and texture of their bones and the 458 is big) is as i described, a situation of light game for the bullet and you would have been safe.
the 458 possibly uses the nosler better due to slow speeds?
axis deer with them even out of a 7mm would be fine.
one of my problems was a huge pig hitting the shoulder blade through the fighting pad with a 210 gn partition out of a 338 win mag,
a 308 150 gn cup and core would have killed it suddenly, as would have a 270 win with 130 gn sierras.
i was lucky to get it with a second shot using a 200 gn speer.
another case was a donkey with a 9.3x64 and a 286 gn partition.
again in the shoulder blade this time side on.
the bullet strike looked like the donkey was covered in an inch of dust.
close examination showed 2 holes.
a small one where the bullet went in and a big one where the nose blew out.
a lucky shot, i had misjudged the range and hit a little higher than i would have liked.
lucky because the bullet changed direction when the nose exploded and went where it needed to go due to being deflected by the nose blowing off.
the pig was the opposite.
i routinely use 140 gn partitions in the 280 for goats and fallow deer quite successfully, and 160 gns in the 7mm stw for similar sized game with happiness based on results.
i nearly gave up on the 9.3, but found the swift bullet to a completely different kettle of fish.
for the 280 i have loads in swift and barnes for bigger animals, and the stw barnes perform well on bigger targets.
bruce.