bohunterg
Lee...
The things that limit long range shooting are practice and wind, I practice a lot and won't take a shot at over 100yds if there is much wind or it is unpredictable.
It is my opinion that Lee gave you a great straight up answer... the biggest factor going at that distancein my mind are the different wind current your bullet will pass through on the way. IMO external factors, that you do not deal with on a regular basis, are the greatest single impact on shootling long distance...