If you are using the 2.5 inch shells I would use the #4 shot, esp later in the season, when the fat is getting a little heavier. i would suggest. 3 inch in either a #5 (if you can find them) or 6s. just a touch more punch. I use a H&R .410 for opening day (thinner but, more leaves) and the #4s did a fine job never lost a one.....