I got into a little discussion with Massad Ayood once upon a time (2008) and clearly demonstrated the low GSR argument isn't valid, which was a primary point in the one case where a handload was even a factor. Here's the only remaining picture from that episode.
A super light load of Bullseye ( the perp claimed it was a light target load) shot at 3 feet left GSR on the white paper. The victim didn't have any GSR, even though she supposedly shot herself.
Note: it was a super light target load, not some monster super lethal load.
The whole thing is just like Don Quixote jousting with windmills! There never has been a case where the lethality of a handload was a factor in the case proceedings.
It's the same as the bogus "unique" lead composition identifying a given box of factory ammunition, i.e. bad science on both accounts.
BTW, I tend to prefer buckshot at home, but everything else is handloads.