variables, one of the variables that will have the most effect on getting an accurate MPBR calculation is sight height – the distance between the centerline of the barrel and the centerline of the scope. To get the most accurate results from any ballistics calculator, it’s important to input the variables as precisely as possible. If you don’t have your own ballistics software program, there are excellent calculators available to use for free at the JBM Ballistics website. Most ballistics software programs will calculate MPBR for any given bullet and velocity. MPBR is the furthest distance at which a bullet fired from your rifle will stay inside the pipe without hitting the top or the bottom. The target size determines the size of the pipe – in the case of all my varmint rifles it would be a 4” pipe. 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 point at which the bullet then drops to 2” below my line of sight is the MPBR for that rifle and that particular load. So I zero my varmint rifles to have the bullet not rise to more than 2” above my line of sight. For all of my varmint rifles, I use a target size of 4” to determine MPBR. The size of your intended target should determine the distance you decide to allow above or below your line of sight. The idea being that you can then aim at the center of the target from the muzzle to the MPBR distance without concern for holding over. Simply put, MPBR is the furthest distance you can zero your rifle for, at which your bullet is never above or below your line of sight by more than a certain amount. MPBR stands for Maximum Point Blank Range. So I decided to put my answers into a short article to post here for future reference. 20-250 projects, I’ve received a few emails and private messages lately asking for clarification regarding exactly what MPBR is and why I choose to use it. Since writing about the extended MPBR achieved with my. MPBR, a brief explanation by Dave Affleck

Point blank range calculator