I have tried several but not the simple shot. I like the Saunders folding falcon best outta commercially made slingshots. Visit the slingshot channel on YouTube. A lot of good info there. I would get the heaviest draw rubber bands or tubing that you are comfortable with and then use a solid lead ball that is 1/2 inch diameter. Lee brand round ball lead moulds are fairly inexpensive. Lead is easy to melt, just do it outdoors because hot lead gives off toxic fumes. The bands that come with store bought slingshots are ok for practice, but in my opinion are too weak for hunting. There are several different types and sizes of bands and tubing on the market you can purchase and cut to size to make your own. Experiment with different sizes and ratios until you find one that works best for your application. When I speak of ratios, I’m referring to the length you cut your bands in respect of your maximum draw length. For example, If your draw length is 32 inches, then multiply that times 40% and that will give you the length to cut the rubber bands. The projectile velocity will vary depending on the band length and the draw weight. There are some web sites that publish this kind of data. Purchase extra bands and store in a dark cool place. Sunlight and heat can cause some rubber to deteriorate faster.