+! for the Pachmayr Gripper. When I decided to fire my first (and only) 357 round out of a 640, that's what I put on the gun - I think it's the cushiest grip you can (easily) get for a J frame. It's effectively the same size as the ones for K frames. Makes for a somewhat silly looking J frame, but if you have to shoot a lot of shots, especially out of an airweight, it's the thing to have between the gun and your hand. Beauty is as beauty does, in this case.
Speedloaders work just fine with these grips. I was going to post a picture, but can't find the one for J frames, just the two - round and square butt - versions for my K frames. (The Gripper is what I put on my 3" 65 when I shoot it in IDPA. I'll carry it sometimes with Magnas and a BK grip adapter, but I tried that combo in an IDPA match once and was practically crippled by the end of the second stage. Had to find the safe area and switch to the Gripper, which was just fine for the rest of the match. No speedloader problems, BTW.)