the design of the open top is not as strong in the end as the remington in anyway. Sure the arbor on a colt is thicker, but the junction of arbor slot, barrel slot, and wedge is the big issue. Ive tried to get the issues explained to me, and the best and most understandable is this:
Re: in regards to your post
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interesting, but the metallurgy of the Italian imports is such, that the wedge bends and the barrel slot area bulges on the sides, after heavy firing over time- if the wedge deforms and the barrel bulges, there will be barrel to cylinder play
the reason the cylinders jam when wedge is pushed in all the way, is because some of the Italian guns are made that way- they start off on the tight side, so as the gun loosens up and is worn/fired a lot, then the wedge will go in all the way and the gun still be tight
I have a Colt conversion that does that, but as I keep firing it, I can see the wedge progressively has to be pushed further in to close up the gap.
eventually they all loosen up
the best fix is, better steels- stainless steel barrel, arbor, and wedge resists wear- stainless frames with stainless threads resist loosening up
the best wedge is one that bottoms out with a heavy lip all around, this way it can't be pushed in too far, made so by design it must be bottomed on barrel when installed. And make it from stainless or titanium so it doesn't bend.
but eventually then, the barrel will bulge on sides- they make those wedges soft on purpose, so they give instead of the barrel or arbor
I've spoken to a few gun mfrs., they said the blackpowder market is in decline, that's why they don't bother making blackpowder revolvers here in the states, no appreciable market. The only one who had the guts to do it, was Bill Ruger. Imperato did it with the Colt 2nd gen guns, but he only made a few parts for them, not the entire gun.
thanks for exchanging emails- IMHO the problem with the open tops in a nutshell is, the wedge or barrel lug deforms after continued firing- the cylinder/barrel gap therefore is not constant- it grows with each successive shot to some degree. The factory wedge system would work ok, if the wedge, barrel, and arbor were made from the best, strongest, hardest material possible- like titanium, stainless steel, or chromemoly steel. To date only the stainless has been made, I have an 1860 stainless made by ASM, it's quite nice and strong too. The brass and steel framed guns shoot loose eventually, the brass rather quickly- although I did have a steel Navy Arms Pietta that held up pretty good over time. The problem is, the Italians nickel plate brass to make it look nice, instead of making it from a really good material to begin with. The average bp/cb shooter is hooked on silly looks, and has limited technical mindset. They'll buy the cheap, but shiny gun, every time.