Bullets drop at different rates depending on their length, velocity, weight, and projectile type. Easy to do and for most folks that have been sighting in at 100 it is so much easier to just keep doing what your doing than reinventing the wheel and then screwing up a chip shot at 100, 25 meters ~27 yards for m4 zero = 300 meter zero. I zero at 100 yards on all rifles. Another factor for long range shooting is the elevation adjustment range provided by your scope. If its close to 2.6 inches then your 308 is now zeroed for 230 yards. If the parameters change, your previously aligned rifle and scope will go out of alignment. Before we begin, lets define what it means to zero a rifle scope. If zeroed at 100 yards, where would you hit at 50 yards? Okay, this is way more complicated than I thought and, apparently, there is no correct answer. http://www.jbmballistics.com/cgi-bin/jbmcard-5.1.cgi. Other related pursuits include reloading and bullet casting. By counting the clicks necessary to adjust a scope, you may exactly measure the degree of adjustment required. In order to consistently hit deer-sized targets at 300 yards and beyond, or determine the best sight settings for long range target shooting, use Shoot! That will give you a maximum PBR of about 260 yards and a second zero of right at . = p.o.i. Its a really common opinion though, especially when ballistics charts like the one lowegan posted are shown. If your rounds arent hitting the target, it might suggest your scope has to be adjusted more. FYI Im not a ballistics expert just a good shot. 90% of my shots are between 120-170 yards. That gives me p.o.a. xXT7J)! If you try to zero at 1,000 yards and then shoot at 100 or 200 yards, your bullet would be totally off target. If you make the necessary modifications after the first shot, the rifles accuracy should increase and your shots should be closer to the bulls eye. This is as a result of a bullet drop. To increase accuracy, make sure you set the scope for proper bullet drop before shooting. If your target is 1,000 yards away, the bullet drop would be several feet, and most riflescopes do not have that kind of range. Ammo2U.com ~ As a participant in the Amazon Associates program and other affiliate services, I may earn a small amount of money if you buy something after clicking on a link. To compensate for bullet drop, you must zero the rifle scope such that it shows the impact point (where the bullet will hit) at a given distance rather than the direction of the barrel. ShootersCalculator.com | Ballistic Trajectory Calculator
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