A 20 gauge harpoon is pretty manly! I'm impressed. Anyone that's ever had a smaller gauge needle's plunger stick half way through the injection will understand why the larger gauge darts have their benefits. However if you're a long term user the larger gauges will cause scar tissue to build up more quickly. It's a double edged sword-pun intended.
21's seem to give me the best of both worlds for drawing/shooting. 23's are for the guys that faint at the sight of a needle and/or can't handle a little extra pain.
I'm going into the bathroom to cut myself with a razor blade now.