I've had a bunch of Uncle Mike's rimfire ammo pouches since the 70's I think, both woodland camo and black, and have had and used most of the products they came down the pike with over the years. Kind of helps that all through the 80's I used to go to Portland on business a couple of times a year. A stop at their factory buildings was a must do on those trips to stock up and see what was new but not advertised yet. They recognized and sold direct to me wholesale, and most trips I brought home a huge box of goodies. Anyway, I have used these rimfire pouches for 22RF, 22WRF, 22WMR, 17HM2, 17HMR and a host of centerfires over the years, rifle and pistol. Not only for field carry hunting, but for truck and range shooting as well. Doesn't matter whether for a tube or clip feed or single shot or handgun - or whether loose ammo or for carrying extra loaded clips or speed loaders. They are just handier to reload from than ammo boxes, the Velcro open/close makes them fast to use and by having both colors I can have different loads handy at my fingertips to pick the one for a situation as it comes up hunting, or for multiple firearms carried as the case may be. I also have a bunch of their ammo wallets, each dedicated to a particular cartridge, so on hiking hunts where few shoots will be taken I'm all set with a quiet way to carry that protects the ammo. As for the cleanliness thing, never had any problem with that either, and I just leave what's left in them for the next time more often than not.
This thread inspired me to check their web site. Unfortunately it looks like they don't offer these ammo pouches anymore. Too bad, they are very handy.
He's two still "primed' from the last time I took a 17HMR out hunting. Despite the 25-30 years of hard use they are still as good as new except for some fading. The black has Hornady V-Max and the camo CCI TNT, so I could switch to a situation on the hunt. I normally use the V-Max for small game, jacks or ground squirrels jumped, the TNT for predators and for all the others at the longest ranges. With my clip feed Hummer I carried the same but as loaded clips in them. Two of the three Hummers I had shot both of these so close to the same POI that going back and forth was never a problem making a perfect shot at even extreme range.