Recently I watched a video by Bill Hayes entitled: "Latex tubes for slingshot shooting, the two favorites I've found", in which Bill reviews the 'light' and 'medium' tubes, and says that he likes the 'medium tubes' best, but also says both offer sufficient speed and power to hunt with.
He tested each half-tapered set with 7/16" steel over the chrony. The light set showed a speed of 230 fps at 10 lbs. pull, and the medium set was at 260 fps with 15 lbs. pull. Note that Bill states any speed of 200 fps or greater is plenty to take small game.
I ordered some heavy tubes from Tex a year ago and have found them to have long life and good power with 1/2" steel and .44 cal. lead, but I believe I will get BETTER ACCURACY with the medium tubes, which I have recently ordered and am anxious to try.
Based on Bill's video, I'm guessing you should go with the light tubes if you're going to use 9mm. Seems they should offer plenty of speed and great accuracy.
As for me, I personally prefer heavier ammo to get the job done cleanly - hence the medium tubes.
As Bill says, Power without accuracy is worthless.
Edited by SonoftheRepublic, 05 July 2013 - 01:17 AM.