With this zero, the bullet will be about 6 inches above the line of sight at 161 yards. However, one challenging aspect of this battlesight zero is the maximum ordinate. Using this data, it’s easy to see why the Army and Marines were drawn to the 300-meter zero as their “do-all” for so long. For reference, the highest impact on the 20″ barrel is 4″ over the zero.
You can definitely see how the extreme spread between the two farthest impacts decreases as velocity increases. A smaller vital zone means a more limited MPBR. The distance from the muzzle, point blank, to the maximum distance before the bullet falls below vital zone threshold is the Maximum Point Blank Range.Ī larger vital zone means a more generous point blank zero and a longer usable distance for the zero. The point blank zero would be setting in which the bullet impacts no more than four inches above or below the center of the vital zone. Point Blank Zero in PracticeĬonsider a vital zone of eight inches in some large game animals. If you’ve chosen your vital zone size and zero well, the rest will take care of itself. Aim at center mass of the target and fire. Remember, the goal of the point blank zero is to remove the guesswork. Sure, you can start aiming higher or lower on the target to compensate– but then you’re no longer using the point blank zero as designed. The size of the vital zone you choose will affect the usable point blank range. Velocity is a huge part of this as well since more velocity shrinks the group size. When you establish a point blank zero, you choose a curve shape where the bullet stays within a certain distance above or below the point of aim. This has some benefits for practical rifle usage, but I’ll come back to that. Something else you might notice is that the apogee of the bullet for a 100-meter zero occurs right 100 meters. These are all correct, and reference a sighting method that takes advantage of projectile ballistics. You’ve probably seen it called many things, including the Battlesight Zero (BZO) or Maximum Point Blank Range (MPBR). The Point Blank Zero is one of the most important methods for doing this.
So the challenge for the shooter is balancing accuracy requirements against available time. In the 1950s, the Army’s ORO researched how people get shot, and the number one factor was exposure time. In the real world, targets actively try to avoid being shot and they won’t expose themselves long enough for you to go through all those steps. Most practical shooters, from big game hunters to military members, do not have the luxury of time to check distance, adjust sights, and take a precisely aimed shot. To be fair, that is a great demonstration of marksmanship and precision, but you need to be aware of the limitations. A lot of people believe that marksmanship is all about that one precise hit on a small target at any range. Most field shooting is not precision shooting.
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