for rabbit i would use #6 pellets .most companies make it easy the box will say light field load,for those mutant rabbits try #4S For deer use slugs,you need to buy a couple different types and go to the range im going tomorrow to do the same i have 10 different brands,you dont need that many .I just like shooting and this is "research" so its justafied 
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Now therefore take, I pray thee, thy weapons, thy quiver and thy bow, and go out to the field, and take me some venison.
Genesis 27:3 "The thinking deer hunter should mature through three phases during his hunting life. First phase, "I need to kill a deer." Second phase, I want to harvest a nice deer. And last phase, we must manage this resource so our children and their children can experience the grand tradition of good deer hunting." - Jim Slinsky
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new to this site 
the 20 will also work on upland birds ,squirells and other small game.the 12 will work but go with a very light load or else you wont have much to eat 
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