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I agree with Mike, but I also would not volunteer the information that I have a conversion cylinder for it to an LEO, if it wasn't immediately apparent.

Another aspect from the business end of conversion cylinders is,  the manufacturer doesn't know WHAT type of "rattle trap" some customers may be installing their products  in .  .  .  which gets you back to Ruger recommending "no handloads".
  As far as barrels go, I asked Walt if jacketed bullets would wear them out, his response was "not in your lifetime"!  So, unless he knows something I don't ( heck, I'm only 66 y.o!!),  I'd say it's not a worry. Set up correctly, these revolvers are perfectly fine and can be treated just as any other modern SA revolver.

  As far as Howell cylinders (and "Taylor’s"), they don't have 100%  support for the cartridge case to back up against (the other end of the pressure column) like the Kirst plate/ring does. Therefore,  I'd say tier1 loads should be considered maximum loads.

This information is also for the open-top platform which is superior to like top-strap designs  ( Remingtons etc.). Of course the ROA is a modern design with a thicker top strap and can definitely handle tier2 loads.

Mike

Good comments, Mike. If I build a conversion revolver, I will probably use a Kirst cylinder. But I will also probably use a Pietta '58 Remington. If it turns out that the barrel doesn't last long, it would be pretty easy for me to make a new barrel from a modern blank. Although, I suppose it wouldn't be too difficult to put a liner in an 1860 Army barrel.

Just a few comments. I'll probably ruffle a few feathers too. First, I don't think the use of smokeless loads will have any effect on the host revolver. The cylinder is what contains the pressure. As long as the pressure is within rated spec, most of it drops off by the time the bullet enters the barrel. The conversion cylinder has its own breech, so only recoil force is passed to the revolver frame. Of course, as mentioned, only lead bullets should be used.

Second, I am not and have never been a fan of Trail Boss. It was always too expensive. A 9 oz can of Trail Boss cost about the same or more than a 1 lb can of Red Dot. Worse, I saw newbie reloaders out there on the forums telling other newbies that if they just got a can of Trail Boss they didn't have to worry about all that stuff they had to do with other powders, because it was just like black powder and you could not overload a cartridge with it. That is incorrect. A .45 Colt case will hold at least 10 grains of Trail Boss under a 255 grain bullet. Looking at the published burn speed, Trail Boss is a few steps faster than W231 and not much slower than Bullseye.
10 grains of W231 under a 255 grain bullet is a maximum Ruger-only load in .45 Colt. To put it another way, if you put as much Trail Boss as you can fit in a .45 Colt case, you had better be shooting it in a .454 Casull. Or better yet, not at all.

Another thing to consider: some people think TB is fine for loading old black powder only revolvers such as an early SAA. Bad idea. TB acts just like smokeless powder because it is smokeless powder. So if you wouldn't load that old revolver with Bullseye, you shouldn't load it with TB either.

I grabbed this pic while testing a shot load. .44 caliber.
I was using 20 grains of 3F, paper towel wadding, and No. 12 shot. A felt over-powder and card over-shot wad would be much better.

Thanks! Making videos is not too difficult. Just getting started, you can shoot video with a smartphone. Download a video editing app to your phone and edit it the way you want it (I do minimal editing; some people edit a lot more). Then open an account with Rumble and upload your finished video directly to them.

Don't bother with YouTube. They are very anti-gun and will likely censor you.

Update:

https://rumble.com/v54jyr7-p1841-musket-update.html

Thanks for the heads up! Mine went to spam too; without your notification I would have missed it altogether.

Thanks! That's about what I expected to hear. I'll probably keep the N2s for now since they don't have many miles on them. But I definitely intend to upgrade to the HSR42, and look at the N4s later.