Maximum Point Blank Range Calculator
This calculates the maximum point blank range (MPBR) of a firearm. MPBR is the farthest distance you are able to shoot a firearm without holding over. This calculator will give you the range you should zero your rifle in order to have the largest MPBR as possible. In order to calculate this you need to input the size of your target. The vital zone of the animal you are hunting is often a inputted as the target size.
What is Maximum Point Blank Range
Here is an example: Let's say you are deer hunting. The vital zone of deer is roughly 8 inches. Using the calculator it tells you that you should zero your rifle at 250 yards and that the MPBR is 300 yards. That means that if you aim at the center of the vital zone of a deer at any range between 0 and 300 yards, you will hit the vital zone. This means that you do not need to worry about any bullet drop or holding over if the animal is within the MPBR.
One description of the MPBR concept that has been used a lot over the years is to visualize shooting with your barrel centered inside an imaginary pipe. The size of the target determines the size of the pipe. The maximum point blank range is the furthest distance at which a bullet fired from a rifle will stay inside the pipe without hitting the top or the bottom.