I like the Speer 135 gr. +P Gold Dots for Short Barrels from my 637 but in practically every test I've seen, DPX produces good results in ballistic gel.
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.