I started to reply to you guys, and the day got away from me yesterday. It was darn cold on Sunday. The wind was raw.
Short answer: ounce of #6's at 1220 is plenty, year round. No need for more than just regular Hi-Brass shells, and frankly, field loads, as long as they have good hard shot, are perfectly effective.
"Miss Jean Louise, stand up. Your father's passin.'"
