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For any steel, 10 gauge for maximum efficiency at maximum range. But, I ended up shooting buffered 'T' shot in the 12 and then the 10 also for the best results. I did not do any ballistic gelatin penetration tests or forensic analysis of the deceased birds, but in my case, I can tell you that 'T' shot produced more clean kills. Even bigger difference on swans. You may need to do quite a bit of playing around with chokes to get the tightest patterns as well. Approximately Improved Modified was it for me. A few thousandths ACTUAL constriction versus your bore matters.
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