True big bores to me start at 458 cal and 500 grains, I only have two levers that meet my definition, an original 1886 Winchester 45-70 firing 505 gr flat nosed greasers at 1240 fps, and a Turnbull '86 in 50-110 WCF firing 700 gr flat nosed greasers at 1265 fps, both rifles are loaded with black powder.
My 1886 40-65 and M-94 in 38-55 are simply mid bores too me.
