Check this out Thomas http://www.fourten.org.uk/mwpre410.html

Drew: Now that is one of the best responces to a post that i've had. Thank you so much for the info. Thomas

Drew: I had never really looked that close to the bottom of the barrels and sure enough right on the bottom of both barrels is the no. 44. I took some differant shells that i have and tryed them. The 410 2 1/2 inch doesn't work but the 36 cal.Rottweil,44 xl,44-40 all fit great. So it looks like I will have to try to find the Rottweil 36 it looks like it will be the mostlikly easy to find. Thomas

i envey you with all them choices in that little 410... squirls to deer all in one pakage... that was some good info on the 44 cateridge.... i may have to try this info in my single barrel cannon breach... charlie

The article linked by Drew mentions a round ball .44 load. I have a hand full of those in two brands, Peters and WRA. The WRA shells are labelled ".44 GG", the GG designating use in the .410 bbl of the Marbles Gamegetter, which we had. The Peters don't have the GG headstamp but are the same round ball load. Full boxes of these GG rounds come up on the auction sites.

Richard: The bottom cartridge in the picture is a U. M. C. 44-40 and it seems to fit good but I think I will stick with the Rottweil 36. Thomas

Good Choice Thomas. I'd bet it's pretty effective, especially if it has the square leading edge. I use nothing but Rottweils in my 20ga Deerslayer because they 'punch' a hole and put a deer down right now.