Had to shoot my Savage Navy, just had ta!!! I started w/ 10g fff and moved right up to 20g on the second shot. I didn't have the right size rb's (too small), but a couple of sharp blows from a small hammer, spread them so that they filled the chamber well. Sort of a modified RNFP slug. The biggest problem was getting the caps to fit. Luckily I tried to cap all the chambers before loading, and found that only 2 were small enough to take a #11 cap (barely). pohill, you said ROA nipples share the same thread so I'm going to order a set that way I don't have to modify the originals. How'd she shoot? Straight and about as high as an out of the box 1860 Army, 5in at 20yds. I don't care, just shootin a piece of history made my day, hell, week!!