Re: 38-55 or 38-56
The 38-55 is a .30WCF, or .30-30 Win, with no shoulder, usually shooting a .375-.377 dia bullet.
The 38-56WCF is a .45-70 sized case, necked to the same caliber, and usually attributed to Marlin, as originator.
In a modern Marlin M1895, 320 grains of bullet can safely move out at way over 2000 fps, with smokeless powder, no sweat, and no pressure signs.
In a Sharps, or Winchester Single Shot, the loads only get BETTER!
Caution: the ,375 Win will fit in 38-55 rifles, and often save you the time of dis-assembly--- DON'T DO THAT!!!
Don't start no s**t and there won't be none, Terry