I run a 357 maximum in rifle configuration to meet straight wall requirements. The legend is pretty much similar.
350 legend because it is a 55Kpsi round makes gains over the 357 maximum a 40Kpsi case
sort of a 357max +P+ rimless so that it feeds better from box mags.
cartridge development has taken 3 maybe 4 paths in the last decade or two
1 long range performance , hotter faster , flatter.
2 long range performance , hotter faster flatter , but still fits in a standard short action.
3 what can we cram in a AR mag hotter faster flatter
4. what can we fit in an AR mag and make fit strait wall states requirements.