I didn't attack you; I pointed out that you are engaging in sophistry and common tactics used by internet trolls, which is true. I implied that that your opinion is without foundation or merit, which vast real-world experience indicates is true. I have presented information in support of this, which you have completely ignored. If firing smokeless cartridges in these guns or advising others to do so was dangerous and irresponsible the experience of thousands of shooters over decades of time would bear that out. It absolutely does not, a fact that you refuse to address. Instead you challenge me to 'guarantee' that it's safe. Since no amount of evidence or real-world experience will convince you why are you willing to accept my 'guarantee?' You aren't; this is just a common tactic for people arguing untenable positions when they are incapable of admitting that they are wrong.
Let's break this down. Instead of addressing facts and real world experience that is contrary to your opinion, you challenge me to guarantee something, knowing that no reasonable person unrelated to the products in question would issue such a guarantee. You do this so that you can claim my inability to do so will invalidate my point. It doesn't, it just lets you dodge the question of real world experience and evidence that you cannot refute.
Please address the actual facts in the real world, in other words that there is no evidence to support your claims about the dangers of shooting smokeless powder in modern cartridge conversions. We are abundantly aware that the guns say, 'black powder only.' We are aware that they are proofed for black powder. We are also aware that Kirst and Howell cartridge conversions are made with modern materials and heat treat, rendering the European proofs irrelevant. We are also aware that thrust, or recoil, is what causes axis pins to pull out or, theoretically, frames to stretch, not pressure. We are aware that the manufacturers of conversions know this,and base their recommendations for loads on this. We are aware that original guns were often made of wrought iron, and are aware than modern cap and ball revolvers are made of steel, and are far stronger than the originals. We are aware that there is not the least evidence in actual fact that firing smokeless loads in these guns is in any way dangerous if the conversion manufacturer's advice is heeded. Please stop side-tracking the discussion to avoid addressing those issues. All you have demonstrated so far is that you can read the writing on a gun and know how to avoid addressing facts that contradict your opinion. You have not offered a single shred of evidence to counter the argument that events and experience in the real world invalidate your argument.
I think pretty much everyone is aware at this point that you are not making a rational, fact-based argument in support of your opinion. You've also made it plain that no information, no experience is sufficient to sway your opinion, and that you will not directly address any argument that refutes your opinion. The evidence says one thing, you say another and will not support your argument. Responding to you further is pointless, and I won't.