Originally Posted by robocop10mm
.30-30 was never a black powder cartridge but people "Understood" the relative power of 30 grains of black powder.
Actually, that is a popular misconception. The term 30-30 was coined by Marlin Arms who didn't want to use their competitor's name on their guns (30-30 = "30 Winchester Center Fire" or "30 WCF"). The -30 stands for the standard load of 30 grains of early smokeless
powder, which was on par with IMR/DuPont's 3031.