well alex, you can do anything you want to with your gun, it's your gun and your life. i just hope that someday we don't read about you in the obituaries column. and no, you have done nothing wrong other than try to shoot objects that were not designed to be shot out a gun, which IMO, is reckless and foolish. no you have been called stupid for not using common sense or logic. and on a final note, i truly hope you don't get hurt or hurt someone else with your "custom shotshells". also, not everything in a shell must come out the barrel, sometimes they blow up!
I do believe that back in the day if you had a shotgun
, sometimes you loaded it with whatever you had.
I've seen accounts of lead balls being hammered flat and then cut into shot with a hatchet. Little square pellets. Used from a musket or rifled musket type by Confederate, Union, and Revolutionary troops to hunt squirrel while on campaigns.