Even factory ammo has gotten screwed up on occasion, but at least if they do, they are the ones getting sued, not me or you. My friend bought some reloads at a gun show once, and on inspection (after firing and while I was teaching him to reload) I noted a case that had several holes in it that he had fired - in 45/70. Enough to swear me off of anyones reloads but my own. I would not even reload his while he was standing there, I made him do it and I supervised.
Now I like the idea of cleaning gear, patches, swabs, oil, bore cleaner, etc as a party favor if the guests are into shooting sports.