Try something other than a Wrist Rocket (or any "braced" style for that matter). Other types are so much smaller, more accurate, and easier to shoot (in my experience). I now shun my old braced slingshots. They are just no fun, can't hit much with them, and their bands are horrible in both "feel" and longetivity.

Here's a good start:

http://www.trulytexas.com/wusa6.html

Here is my favorite (of this "Dankung style" slingshot):

http://www.trulytexas.com/bpth.html

But this "Palm Thunder" model above is VERY small. You will probably like these ultra-smalls after you have become proficient with a slingshot. If you haven't shot this Dankung type of slingshot before, you might do better starting out with a larger model like the Jungle Hunter II. You do not hold them like you might think (like a hammer). You hold them with your fingers high up on the forks, like this:

http://www.dankung.com/dk/images/XIE.JPG

This grip takes the strain off your wrist and gives you more power and accuracy.

You can buy these same slingshots, and many other variations, direct from the manufacturer in China for little more than half the price of buying in the US. You just have to wait about two weeks for your slingshot to be delivered (assuming you choose the cheap shipping option, which is ridiculously cheap at about $2, at least the last time I ordered it was that cheap). Don't let "China" bother you. These are extremely well made slingshots. Some Chinese places, and eBay, sell knock-offs made of cheap metal that can break and be dangerous. This Dankung website is a reputable place that uses stainless steel in their slingshots, not chrome plated pot metal like the knock-offs.

Here is a link to that Palm Thunder slingshot, except direct from the Chinese manufacturer rather than from their USA importer TrulyTexas:

http://www.dankung.com/emart/black-palm-thunderusa-p-342.html

Much cheaper!