I had a couple of boxes of it and it worked fine in my S&W M&P 22 pistol. It was nasty dirty, but so was everything else I put though it and my Henry lever .22. Cleaning them at the same time was a very messy thing. I didn't buy any more of it, not because of any complaints about it, I just didn't see any of it when the dam broke and .22 became a "Oh, that's a decent deal on .22LR, but I'll pass!" because it appeared everywhere, and I stopped buying it just because a brick was there. I don't think I have ever bought anything I didn't need much of as much as I bought .22lr for a while. Maybe potato chips?