There are 150 pellets of #5 shot in 7/8oz. You state that you have 15 pellets in a 30" circle. That's only a 10% pattern , that's more open than a cylinder choke. IC choke is 50% & would be 75 pellets. Numbers don't add up correctly
If you are using 7/8oz of BB's on the pattern board there's 44 BB's & your 15 equals 33%. That's equals to cylinder choke.
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