30-30 has godly muzzle energy, the best ruger loads in 45 colt dont go past 1000fp me.
thing is, the 250 grain at 900 fps negates the muzzle energy aspect completely. most non ruger hunting ammo maxes out at 450 fps out of an 8 inch barrel. a 4 inch 357 with a 158 grain is a typical 538 fpe if you use federal fusion loads.
if you focus on energy, standard 45 colt loads equal the 44 special, and that still equals what the 45 acp can do. not exactly high on the energy list.