Good question
IMHO a reloader is someone that tries to duplicate factory loads (for a lower cost) or makes ammo that "works" in his gun, so he can go out and shoot/hunt.
A HAndloader is someone that dicks around alot, maybe forms cases, maybe tries lots of different angles on a load, etc.
Bottom line: A reloader fills up his cases and bullets and goes shooting, a Handloader goes further. The Handloader wants to tailor his loads to his guns, the reloader wants to make ammo to shoot.
Nothing wrong with either. I am both, depending on firearm.