If you're a handloader, never load the maximum load in the manual and actually it's a good idea to stay well south of it. This is not the situation to be macho.
If you think or feel for some reason that you need a more powerful load than a "medium hot" load from the manual, just go buy the next bigger firearm.
Maximum loads, actually close to maximum loads are where things can start to go wrong, possibly bad wrong.
Primers backing out, primers flattening out, case mouths splitting, are all warning signs that one is pushing it with their handload/firearm combination. Look for these things and learn to spot them, and to be happy with a good solid reliable practice load for your caliber.
Go ahead and load some hunting loads or other types of practical usage loads too if you're so inclined, but the same laws of physics apply.
Sincerely sorry about the guy losing half of his hand.
Could also have been a double load, obviously. Extremely doubtful IMHO that such a thing would be caused by lead buildup in the barrel. Pay attention, focus, and don't let people mess with you when you're handloading, and keep components for only one caliber/load on the bench at any given time. Turn the TV off too.
Ping to 19, hope you’re doing well these days.