I have used the Buffalo Bore's in a 336 in .35 Rem, and I can tell you they are very accurate in my rifle, and a big improvement in terminal performance over the regular "Reminchester" stuff, but in that particular caliber they are loaded above normal pressure and the boxes are marked "for Marlin rifles only".
As for the Hornady's...
I have shot several whitetails with the .45-70 Leverrevs.
All have been one shot kills.
ALL have violently expanded... exploded even... almost immediately upon impact with the animal.
In most cases the ENTRANCE wound was several times the caliber size, and the EXIT wound, if any, was much smaller.
In one case the bullet failed to exit.
This tells me the bullet is shedding it's jacket at best, and at least in the one case, fragmenting.
Wounds have been massive... innards pureed... lots of hydrostatic damage... but very shallow penetration.
Deadly medicine whitetails and other thin skinned light boned animals if you are willing to wait for the broadside shot ?
Yup.
But if your after something heavier, like bear or ?, I would look to a sturdier bullet.
They have heavier hides, a lot of fur, and a lot of mass in their shoulder bones and rib cage.
That's a lot of animal to punch thru to hit the vitals and you wanna make them leak out both sides.
Can you kill one with light, fragile, expanding bullets ?
Yup.
If you had a perfect broadside shot, and birds were chirping, and the sun was shining, and all the stars were in alignment, and God was smiling on you, and Moses parted the Ribcage Sea.
But is it the right bullet ?
Nope.