Learn about your pellet guns... They have some that will kill people. I've known people that hunt with them. You can get some very good pellet guns for these applications.
Granted, it's not going to be your 60 dollar Daisy from Service Merchandise. But they have them for hunting coyote and groundhogs.
Hell, I was looking at a .308 pellet gun at the gun show that you charge with a SCUBA tank. He had one that was 9mm as well as .45.
Did anyone read the article in this month's American Rifleman about the air rifle that Lewis and Clark carried with them? Pretty interesting. I had no idea that they were so powerfull, or so available in that era and earlier.
Learn something new every day...
Matt