Well I couldn't find any all copper 22 lr rounds anywhere, but my local mom and pop gun store said they just got some 21 sharp rounds in. They said while it may not be quite as accurate it should work fine in my 22lr rifle. I took some shots with them as I was finishing up my range session and I couldn't even get on paper at about 40 yards. It was getting dark so I had to pack it up and couldnt shoot any closer range shots to see poi. Has anyone tried this with any luck? I have a CZ 457 and it's a match barrel with pretty tight tolerances, I use a 17 cal jag and brush to clean. Was thinking this might actually work out OK but so far I'm thinking I might if just wasted 30 bucks.