Hey W-yams,
I use the RCBS Chargemaster Combo for extruded powders for rifle. If I am loading something pistol wise and I am not running my Dillon Powder measures, I have 3 Uniflows that I think are absolutely spot on. You will need a good mechanical scale as well. I have 3, 2 x 510's (one for my mini bench in my house and one for my motor home) and 1 x RCBS 1010 for The Cave. I use my Main Uniflow on my 550B as well sometimes. Depends on my mood and what I am loading and what type of powder, etc...
I recommend you getting the RCBS 505 scale and a Uniflow. Perhaps even a trickler and a good old fashioned set of Lee Dippers. I have loaded 1K's upon 1K's of ammo with this. I must admit a good mechanical scale and Lee Dippers will also get the job done. Simply drop the main part of the charge with apropriate dipper and then trickle with the dipper direct to scale pan. A bit old school but really works well.
LGB