The 348 Ack holds about 10-12% more powder than the 348 WCF. It is very close to the 35 Whelen in velocity and energy. JFE, you are partially correct, but Johnson was a WWll
Marine not satisfied with the 45-70 or 30-06 he had hunted with. In looking at my 450s, its easy to see that while the 348 and 45-90 have similar cartridge case head base diameter-
they are different by a couple thousanths....Thus it is easier to use the existing 348 case dimensions to open it up to either 458 or 510 chambering. The 50-110 may require barrel set back and re-headspacing. The 50-110 is actually the
case that the 348 is based on. For brown /grizzly stopping at close range, the big fifty in either caliber gets it done. But, the 450s in my own experience are more accurate and there are more bullets to choose from. Johnson also developed the "Fifty" as he called it by using a modified 50 BMG machine gun barrel-turned down and re-chambered. Starline also
produces readily available 50 AK new brass-ready to hand load.
