Cute is my wife's 22 derringer. I was looking on gunsamerica.com and saw that one. I didn't know they made in calibers that high in a Derringer. I searched the 45-70 and that M4 Alaskan Survival that American Derringer Corp makes its sweet. Shots 45-70 on top and 410 on bottom.
I own one of the 3" barrel versions. I have shot the short 410 shells in a field load. It is really not that bad. I have not tried a 45LC yet. Pretty neat little pocket gun, but it is fairly heavy for it's size.