Funny thing is . . . there's a guy that has explained more than a few times that it is purely testing for the open-top platform. To load ammo that will eventually show how a "correct by design" open-top will hold up. You can't do that with b.p.
This particular forum won't allow pictures ( well, MY pictures) of my testing "equipment" which consists of 2 Uberti '60 Army's and 2 Uberti Dragoons. SOME folks may be interested in how far their preferred "open-top" can go before showing signs of pressure limits . . . exactly like has been done with "hot rodded" calibers before . . . which brought about the "magnum" ammo and revolvers that shoot them.
Some folks understand that Italian copies aren't built according to Colt design while others apparently think Colt got it wrong and the Italians are "all that".
So, no mystery here. If folks would read the whole post ( or posts) rather than " pick and choose", they might understand the process.
Conversions are historically correct but some here would rather decide for others what they should shoot and how they should spend their money. Even factory Conversions are in need of "tuning" and "correction".
I figure, if it's something you're not "into", don't comment. I don't even look at anything referring to flintlock/ percussion single shot rifles/pistols . . . not interested in the least . . . been there/ done that.
Mike