I've never built one, but Kindler had a write-up on the .20 Pup in his "Terrific Twenties" book. A friend of mine has the .22 Waldog version. It is an amazing little cartridge! I personally saw him take two PD's at just over 700 yds a couple of years ago in Wyoming...first shot! I was stunned for such a little cartridge it would even shoot that far. The thing is super accurate also. 410gauge
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