Just a quick FYI for fellow revo carriers. Last week, when carrying my Ruger Security Six, I had 3 speedloaders for reloads (Safariland Comp II K-Frame speedloaders, which actually work just fine for the -Six revos, and are slightly smaller/less bulky than the Comp IIs Safariland specifically designates for the -Six); 2 of the speedloaders were carried in a Bianchi dual speedloader case on my strong sied, just ahead of my IWB holster (and yes, they're actually concealable when wearing a suitably-sized outer garment, in my case a Propper Icon softshell vest).
The remaining speedloader was carried loose in my vest's strong side handwarmer pocket. Wen I go home and was de-gearing for the night, I was a bit shocked to discover that a normal-sized paper clip had perfectly vertically wedged itself in with one of the cartridges...
My wife had given me the day's mail in the morning to put in our mailbox, and had neatly paper-clipped the envelopes together; on mailing, I had removed the paper clip and placed in in the same pocket as the speedloader. Mr. Murphy promptly took over from there.
It was pretty tightly wedged in; I removed it before actuating the cartridge release, but I'm certain that it would have made reloading highly problematic-at a minimum, the one cartridge wouldn't have moved, and I'm not sure with the paper clip inserted if the speedloader could have physically been inserted far enough into the cylinder to have actuated the cartridge release.
Lesson learned: Loose reloading devices are probably best avoided in general, but if situationally necessary, one needs to scrupulously check and ensure the pocket is free of debris that could work their way into the speedloader/loading device and inhibit function.
Ruefully Best, Jon