t-star is completely correct, of course. While I have it on actually
good authority (not merely the usual internet scuttlebutt - like this

) from someone who was involved that the gun was proof-tested with Bullseye, proof-testing is one thing, and usage is another. We don't even know how much Bullseye was used, and no one should ever never try anything like this. I certainly recommend that no one go near these guns with such an idea.
Here's a problem you'll run into with smokeless or even 4F black powder: the ROA uses caps on nipples with powder and bullets directly into the chambers - an "open" ignition system. Pressures go up too high, and you'll have that hammer blown right back.
Not good for the gun.
I have a very experienced friend who used an interesting homemade device to load hardcast bullets into his ROA over mild loads of a smokeless powder designed for mild cowboy action shooting loads (I will not go into details, and I strongly discourage anyone from so experimenting). He reports that he found that he quickly reached a point at which increasing the powder charge resulted in a
lessening of velocity from the gun, and attributed the problem to there being no way to crimp the bullets into the cylinder (to allow pressures to properly build as they do in a cartridge). I'm sure Giovanni Battista Venturi could easily explain this phenomenon to us. So, not only is it dangerous and bad for the gun, it also doesn't give especially worthwhile results.
While it was interesting to hear about my friend's experiment, it's completely outside the design parameters of the Ruger Old Army. With 777 and Buckhorn 209 available, the Ruger Old Army can do some pretty remarkable things in a completely safe way. (As I've reported, I get over averages around 1100 fps with minimal spreads with only 35 gr 3f Triple7, a CCI #11 Magnum cap and a 143-grain .457" ball.) It's possible to drive 190-gr conicals at over 1k fps average, pretty easily, really.
Again, t-star is totally correct: there is no sense - and there turns out to be no real
profit - in playing with smokeless in this gun. Fortunately, it's a wonderful device for use with Holy Black or black powder substitutes.
