I would use 7 1/2 and go for a head shot. You'd have more shot and the 7 1/2s will do the job. Your powder to shot ratio is on the money. Maybe load up some 6 and 7.5 shot shells and see what patterns better, every gun is different. My wifes 28ga wouldn't pattern 8.5 shot worth a darn.
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Paul Harm
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