Triker, you don't say what gun you are shooting but a 200 gr bullet should be a dandy for just punching paper, shooting tin cans, etc. Cheaper to buy & they should work just fine in your gun with Unique, one of the most popular six gun powders of all time.
You will hear the usual complaints about it being a bit dirty & it is but it's also a very good powder. Others are Universal, Power Pistol, Longshot, Titegroup, etc. Many powders work great in the 44 special. A more common bullet weight is the 240-250 gr bullet & usually they do shoot a bit better at distance but you probably won't be shooting very far & those 200 gr slugs should work just fine. Just use a sandard LP primer & have fun. Flat base bullets work better than the bevel base.
Dick