I think pattern density is your issue here. I shoot the Remington Premier Magnum loads which are 3" number 6 plated lead shot. I pattern them on a Turkey target at 40 yards max then again at 30 yards. They are awesome out to 40 yards with an Undertaker Turkey choke. Getting out to 66 yards with any Turkey load seems a little extreme to me. Even with the tightest tube I can't imagine your pattern density being tight enough to put a bird down lickity split.
Is that as close as you can get?
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