Wild birds over pointing dogs, one ounce of six's in a 2.5" 12 ga. I will some times back it with a 5 in the second barrel. I've used the same loads when I'm shooting backup they just seem to work well for me.
Game farm birds 7 1/2 trap loads work great, I used them for shorting pheasants at hunt tests.
Don't you mean 2 3/4"
NOT 2 1/2"????