The irony of this entire discussion is that, if you give it some thought, is that shot, any shot, is toxic to birds if they are centered well in the pattern. Sustained lead of follow through method. Don't know why it is called non toxic when it pretty darn toxic to well shot birds.
Now, do not start with the metallurgical mumble jumbo as I am attempting to lighten this discussion. I understand the different shot metals and been hunting waterfowl and upland birds for better than 5 decades.
But, birds at 100-120 yds.? Not saying it cannot be done. Only that drawing them in close has been my mantra. Hey, i'm Just a old waterfowler that has had some success and lots of enjoyment doing so. MTG