Pop had close working GSPs, and sued a 20 ga SKB with good effect. First shot up was 7 1/2s, 6s for the backup shot. I used the same in a 12 ga, and sometimes 5s for late season.
You didn't mention choke, which is part of the equation. Depending on range, IC to Full is needed. I'd rather thave too tight a choke than too loose.
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