I just put an Uberti 1851 .38 special cartridge conversion on layaway, it just screamed to me to buy it. I would like to shoot a black powder substitute out of it, specifically 777 because I have a bunch of it around. Does anyone have any experience loading cartridges with this stuff? Anything special I should do different from loading black powder? How about any opinions on the Uberti revolvers, this will be my first one. Anything I should look out for? Thanks.