This is Mongo, my largest handgun. He weighs four and one half pounds. He is chambered in .45 P.I.T.A. A self explanatory acronym. A 45-70 case cut down to 1 1/2". I made Mongo a few years back out of scraps of steel and a barrel that Les gave me.
Obviously a copy of a Rolling block, with a few tweaks, all coil springs being one. I chambered Mongo with a drill bit
and screwed up my first attempt. Mongo was supposed to be a .45 Colt. A one size larger bit and a lot more care resulted in a serviceable chamber that the shortened 45-70 case fit in nicely.
My favorite load is a 385 gr 45-70 bullet ahead of all the 4227 that I can stuff in the case, about 18 grains Recoil is mild and I have no idea what the velocity is. Probably not more than 600-700 FPS, but judging by how hard it whacks my steel gong I'm guessing it packs a pretty good wallop.