I believe there could be a velocity "wall" regarding resistance. But, is it unique to each bullet weight ? What single factor or combinations of factors in the design minimizes or maximizes it, or neutralizes it ? All beyond my level of investigative capabilities.
The .458, 325 grain Safari Solid is impressive to me. It is the poster child for sectional density is not the single holy grail factor for penetration. Perhaps that is why I am so fond of it. Plus as a hard cast flat point fan, I think it is one handsome bullet. The lever gun version certainly enhances the 45-70.
The limited-penetration solids as in the .458 North Fork Expanding Cup Point Solids in 325 & 350 grain would be pretty potent for anything in North America. The 350 grain in the 458 Winchester & Lott gets my vote for the In-The-Timber bullet.
The .458's pretty much have a bullet for all occasions.
