To start I’d decide what kind of call surface you want. I think when your saying slate you real mean pot. You can get pot calls with grey, green, or red slate, crystal, glass, ceramic, aluminum, and probably more. Each surface has a strength but slates sound good and are easy to run, glass is good for if it’s windy or you just need more volume. Their are a lot of great call makers you can buy pot calls from for 50-75$ each. I would also recommend to get on old gobbler. They have a lot of stuff in their pot call classifieds section. Also contact JLH (Jeff Harrison) and get a couple strikers from him. While your over there look up Buster Halford (Gobbler2577) and order a pot from him!
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