pure lead cores bonded to pure copper jackets in some form have a lot going for them.
they open fast, but hold together well.
the minute you go away from those 2 basics you lose performance at high or low velocity, and on big or small targets.
hardening cores with antimony or using tough alloy jackets only works in very specialized situations.
the swift aframe has proven superior to the nosler partition on big and small game in 7mm and 9.3mm.
this includes feral goats, wit a 280 rem, where the swift is clearly and statistically a faster killer than the nosler , while also being superior on donkeys.
might this apply to leopards as well in an appropriate calibre?
in the day the 400/350 rigby was considered highly.
a 310 gn bullet at around 2000 fps.
its bullet was a very long cup and core that could keep expanding and losing mass and yet still have mass and frontal area to keep travelling.
it is said that while the 350 rigby magnum shot flatter, with its 225 gn bullet, also cup and core, it was never the reliable killer of the older cartridge .
nowadays swift and northfork have the benefit sf the 400/350 killing power combined with the trajectory benefit of the 350 magnum faster bullet.
bruce.