I used to agree completely with all the earlier comments on prosecutors and recited chapter and verse on Ayoob's failure to give examples as mentioned in magazine articles on the subject. I happened to do this on another forum that Ayoob occasionally posts in. He came back with a link to a longer list of cases than I would have supposed existed in which the prosecution (civil or public) did indeed make something out of hand loads being used. He points out that unless a case sets president in some way, it often remains only a matter of local record, so it can take some work to ferret examples out.
I'll have to find the link at some point, but he had them on line. I can't recall if it was a stand alone page or a reply in a forum? I do recall something about eating crow, however. I think there were at least four cases.
So, that has given me pause. It is, however an issue of prosecutorial ignorance or, in a civil case, a cynical attempt to relieve you of your money. None of that has bearing on my faith in my handloads, themselves, though. We had a post here awhile back. when this topic previously came up, from a fellow who had fired many tens of thousands of rounds of factory loads in evaluation for, IIRC, government agencies? He said he'd seen every possible kind of failure a handload might have in the commercial ammo at one time or another. Too hot, squib to no powder, backward primers, etc. etc. Commercial loads can also have failures hand loads cannot. For example, I found two bulk Winchester .223 cases without flash holes the last time I bought some. No reloader could have the failure that would cause, because his cases have already been successfully fired once, and no handloader of new brass will have that if he is diligent. Unlike a commercial ammunition maker, the conscientious handloader can take the time to visually inspect every single component. That's where he can beat the commercial makers on reliability if he decides to put the effort into doing so.
There are other steps you can take that a commercial loader can't have time for. For example, you can pre-weigh and match cases and bullets so that you can detect a missing or undersize powder charge by weighing the finished rounds. You can add primer and bullet sealant where only some manufacturers do the former and only military loaders, like Lake City, the latter, AFAIK? You can uniform primer pockets and deburr flash holes. You can weigh every charge. You can trim every case for best matching crimp tension. You can measure individual primer seating depths and bullet seating depths. There's really quite a bit you can do that, though unnecessary 99% of the time, can't hurt the effort to make more reliable ammo than a commercial manufacturer does. You just can't crank out as many as fast.