i used to live in an old farm house that was visited from time to time by a possum. never figured out how he was getting in my house, but he would wake me up at night prowling around in my kitchen. i baited up a large have-a-heart trap with sardines. his tail was so long that the door wouldn't completely close, but it slowed him long enough for me to get off a lucky shot from my k38 loaded with 3.1 gr. of 231 under a 148 gr. wadcutter. this possum was in the 15 - 20 lb range. didn't have any scales handy or a measuring stick but he had a long set of front teeth approaching an inch. i had a 22 pistol loaded with cb caps but i was afraid i would just make him mad if i shot him with them.