Here in mid-Missouri we are having a problem with armadillos digging up everything and getting jammed in farm machinery when cutting hay, and combining. I keep a 20 gauge shotgun by the door loaded with 3/4 ounce number 6's for the squirrel problem in our pecan trees in the yard and eating all the wiring out of our cars. So, my question is, what does it take to kill these armadillos, usually at a close range? Will the shotgun do it? Or will I have to resort to my deer rifle? (45-70 with 300 grain RCBS cast projectiles)