This is beginning research for a several month long future project to develop a super long range load for some ducks that I have found flying over a river at about the same time and location every day, year after year, very high. I am having a 3 1/2" 10 ga. threaded for screw -in choke tubes, and have been offered the opportunity to try the manufacturer's various constrictions in their chokes to find what I need without having to buy them all. Determining a shot material and size shot is the first step in the reloading process for this. The barrel is being threaded by them now. I'm thinking about "shooting for" 1 3/4 oz. of a non-tox equal to, or denser than, lead. This BTX looks interesting.
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