Hey guys my girlfriend has been out shooting trap and skeet with me a few times and is really doing good. Says she wants to give hunting a try next year. She's been shooting my buddies 870 20 gauge and the gun really fits her good and is comfortable. She's got an old softball injury in her right shoulder so recoil is a big issue so a 12 gauge is out of the question. My question is this will a 20 gauge be enough gun for bringing down ducks. Also will I be able to find steel shot easy enough in 20 gauge shells. Thanks for any input.