Researcher had an excellent thread on Shotgunworld about the evolution of 44XL, .44-40, and .410 shotshells, but the images were lost in the Photobucket fiasco

The 44XL and 28g "Small Double" were first listed in the 1910 H. & D. Folsom catalog. Catalog No. 13 1916 listed the gun in .410.



To be clear, 44XL shotshells could be used in the (new) .410/12mm chambered guns, but not v.v.

Folsom catalog No. 18 c. 1921 listed the "Midget Field Model" for 44 XL or .410 - "The one gun takes both sizes."



Here's a thread about using resized .44-40 brass
http://jefenry.com/main/The44-Shot.php

https://sites.google.com/a/damascusknowledge.com/www/home