If you don't want to tear up close shot birds as much, switch to a heavier shot size. #4 or #2 if you can find it. Fewer pellets with full penetration will bring them down well and not have the bird full of lead when it's time to eat.
If the OP is hunting pen-raised birds, most folks who run those facilities don't want you using shot larger than #7.5 or 6, due to the hazard of hitting other hunters in the area.
Check before you go!
