if you are looking for a multiple fomat/single cartridge combination, take a look at the 10mm Magnum. It will work in a rebarreled 6.8 SPC AR or bolt action rifle, fits a rechambered S&W M610 revolver, and IAI made semi-auto pistols for it. Ruger even made a few 10mm Blackhawks that can be rechambered for it. Personally, I'd leave my long gun or carbine chambered in 6.8 SPC and make my 10mm Magnum brass from used cases.
quote from BigG:
The 351 and 401 Winchesters were BIG failures used in blowback autoloaders with inordinately heavy bolt carriers. They make a 30 Carbine look like a good idea except for the anemic cartridge which seemed to be a specialty of Winchester.
Uh-huh, right. The M1907 Winchester with its .351 Self Loading round were very popular among law enforcement and prison facilities. Some still had them in their inventories well into the 70's. They also served in various military units in WW1. The depression era criminals preferred them over the Thompson (despite what Hollywood portrays) because of the power. The 180gr bullet launched in excess of 1800 fps which is .357 Maximum territory. They were hardly failures, but simply rendered obsolete by more modern designs.