Hoodie, congrats or your purchase. A lot has been covered that I don't need to repeat. georgia-arms.com has 45LC ammo in small quantities and in Canned Heat (bulk) They sell HP's: 200gr Gold Dots and 260gr. As with pretty much any ammo right now, availability sucks. But I have used their ammo and am way satisfied with it.
As for what your Judge can and cannot do, visit theboxotruth.com
They did a bang up job on the Judge, literally!
My son's coworker just bought a Judge and also couldn't find HP ammo. As I was going to the Orlando Gun Show to look for reloading supplies recently I bought him 50 rounds of 260 HP's from Space Coast bullets. $32 w/tax. As for the 45LC being an SD round: I sure as hell wouldn't want to be thumped in the chest by a round.