So Ken and all,

Shooting the same bullet.

Will a cartridge case holding 60 grains of slow powder (RS Magnum) at 50,00 psi have a longer barrel life
than the same case burning 50 grains of a moderate faster powder (RS Hunter) at 60,000 psi?

10 grains more 10,000 less psi
10 grains less 10,000 more psi

Which one will produce more heat?