I have some lifters that have 170 and 190 pellets described in the research letters with the same target/distance that I assumed are full and very full choke. I have another lifter that is 120 pellets that seems to me like a cylinder choke.
Dean knows more about this than I do and measuring is the best way to know for sure(I personally don't have those tools). And of course you could shoot and pattern it. Based on my lifters and research letters, yours seems closer to improved cylinder.
Looks like you'll have to do some shooting and let us know
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