Why imagine a 20" circle as a target, instead of a realistic 10" one? Why be so stupid as to be carrying a bolt aciton, or be in the open, in daylight? Nobody you'll see, holding still, is any threat, cause they're stupid. You won't hit them if they are moving, at anything like 1000 yds, because it's not possible to gauge their speed that accurately, and because the bullet will be in the air for 1.5- 2 seconds, in which the man can easily stop, turn, change speeds, etc, making you miss. Wind can easily lull, or gust in 1.5 seconds. You have no control over such things, so WHY alert people who don't have a clue of your presence, hmm? If you NEED to stop them, you'll have to get a lot closer than 1000 yds, and hit a lot more than one of them. Such is not difficult, and if you think it's dangerous, it's cause you are inept or improperly equipped.