Being that the hoarder\doomsday preppers are still hoarding everything they can get their hands on, I decided to buy a few 50-round boxes of these things for my .22lr revolver so that I'd have something to plink around with. Of the 100 rounds I fired, all 100 rounds worked. I can't say whether or not they are quieter than standard .22lr ammo as I was at an indoor range and was already wearing ear protection. But they "seemed" about as a loud as standard ammo.
The retailer warned they probably wouldn't cycle through a semi-auto weapon. But I tried 10 rounds through my Ruger 10\22 and they worked.
I used the other 90 rounds through a revolver. After opening the cylinder to remove the brass, I noticed this almost sand-like grit coming out of the cylinder which could have only come from the ammo. Apparently, this ammo is rather "dirty", if you will. I also noticed more fouling once I got the revolver home and cleaned it.
Also, as mentioned in the details, the rounds will "keyhole" if the rifle twist is not fast enough. I'm not sure what the twist rate is on my revolver, but at 10 yards out, they were already tumbling.
I'll probably buy a few more boxes for my revolver just so I'll have "something" to shoot with until folks stop hoarding the ammo from everyone else. But once normalcy returns to ammo inventory, I'll just buy standard ammo.