What about a bazooka??
Bazookas rate right in there with RPGs, and grenades. To get ahead of the curve, start to stockpile those WMDs now - they'll be needed for deer in a few years. Just think, you can plant your WMD along a trial, climb up into your treestand, wait for that armor plated
whitetail to come by, and trip the trigger by remote - kaboom, deer down