i think it is important to mention something here as i havent seen it done yet. it is important to keep a logbook and record what you do exactly. this way you can repeat a shot or come very close. with proper data keeping, it is very possible to get 1st or 2nd shot hits at distances of 140 on pigeon clay sized targets. here is what i use to keep everything sorted. Many never realy get into this kind of shooting because they only have a go at it once, it takes them so many shots to get on target, but all that is wasted if no record is kept. im flipping through my pages everytime i want to make a long range session and sorting them by distance and season. I said by season because i get a good change in elevation(+\-3,4MOA) from summer to winter.
http://pic18.picturetrail.com/VOL888.../289555508.jpg

it is very rewarding to skim through and see what you did on that particular day and its a learning process too.
btw regarding the 200yard shot, its gonna take you alooooott of elevation. just looked at my 170yard data sheet and i had dialed 55.5MOA+3mils and about 1.5MOA of wind to hit a ceramic plate 12x12." i had hit 2" off the POA