The height of the tree canopy often dictates what load is best for making clean kills on squirrels.
"I'll buy a case of high-brass 6s, and it'll last me a year or two, but that's all I shoot at squirrels unless I'm hunting longleaf piney woods, where fox squirrels love to stay way up in the top," McCollister said. "There, I'll have a pocket full of turkey loads, typically No. 4s."
In the coastal marshes along canal banks, where there are thick patches of low and mid-story myrtles, willows, scrub maple and water oaks that are inhabited mainly by smaller gray squirrels, low-brass 6s, 7 1/2s and even 8s are just fine.