The 50/200 is a defensive MPBR and designed for a torso of a human being. 4. With the 50/200 zero, I should be able to place my front sight or red dot or … If you want to learn how to do a maximum point blank range zero, go to YouTube. With my .25-06 that meant I had a 285 yard zero and a ~360 yard maximum range. Remember that 1” at 100 yards is about 1 minute of angle (MOA). Then the bullet's trajectory (both elevation and windage) is listed for 150, 250, 300, 400, and 500 yard distances. Target size determines how far above and below the line of sight a projectile's trajectory may deviate. Now let’s bring it out a new MPBR zero which allows us to stretch that useful range out a bit more. The MPBR is the maximum range at which the bullet rise and drop stays within the vital area of your target. Maximum Point-Blank Range (MPBR): The Best Rifle Zero For Home Defense? Caliber, please 11-04-2010, 02:38 PM. We all are aware that the bullet trajectory is an arch, not a straight line so we need to align our sights at range and get a zero to compensate for longer or shorter ranges. The concept for an … Although Mr. O'Connor didn't use the term “maximum point blank range” (MPBR), that is what he was essentially referring to. Maximum Point Blank Range (MPBR) is simply the farthest end of that distance. MPBR is the farthest distance you are able to shoot a firearm without holding over. Sep 29, 2020 #40 That's about enough. This is a spectacular contribution! WE ARE NOT ACCEPTING PRE ORDERS ON ITEMS MARKED OUT OF STOCK. If not, what range do you zero your rifle at? Maximum Point Blank Range for 10 inch Kill Zone (160 gr 7 mm Rem. From the muzzle to the maximum range of a 10” kill zone and the maximum point blank range, will allow the bullet path to rise above the line of sight 5” and drop below the line of sight 5”. This calculates the maximum point blank range (MPBR) of a firearm. I will ZERO for SUPERS through Supresor and find the offset for SUBS and only shoot subs under 125 yards probably. That will get you in the ballpark. Shoot for confirmation another 3 shot string from a cold barrel. By setting our zero at 245 yards, we will be able to make hits on a 6” circle by using a dead center hold all the way from 0-283 yards.  No adjustments, no over or under holding, no doping or ranging necessary.  The table below helps illustrate the path of the projectile as it exits the barrel: Due to the height of the optic above the barrel, the projectile starts off lower than our point of aim for the first 45 yards or so.  It briefly crosses the reticle before rising ABOVE our point of aim for the next 200 yards before once again crossing our point of aim, then dropping below the point of aim and eventually falling to earth.  If our target is standing exactly 245 yards away, the projectile will impact exactly where the reticle was held.  At 150 yards, our projectile hits 3 inches HIGH, and if they happen to be standing 1 yard or 283 yards away, the projectile will impact 3” BELOW the reticle on a center hold.  This gives us the ability to hit a six-inch target from muzzle contact all the way out to 283 yards with a single, dead center hold. If the center of your grouping is low a 1 ½ and right 1” you can adjust to center. Bringing this concept into reality for a moment, the average human face presents as an oval target approximately 6 inches in width and 9-12 inches in height and a standard IPSC/IDPA size target consists of a 6-inch square ‘head’ and an 8-inch perforated circle in the center of the thoracic cavity.  Therefore, it is logical to use a six-inch diameter circle, or a 6-inch vertical ‘resolution’, as the first defined constant in our equation. A little “Ballistics 101” will help further our discussion. Once the desired vertical resolution is defined, it is necessary to determine the ballistic trajectory of the projectile exiting our carbine.  This requires the following variables to be defined: As you can see, the MPBR method is going to ‘tune’ our zero to our exact combination.  Muzzle velocity is of course dependent upon our barrel length and the powder charge of our ammunition, so let’s look at a few common combinations so we can begin to see how the details might come together: 5.56x45mm 55gr XM193                               .300 Blackout 110gr V-Max       Â, Barrel Length     Muzzle Velocity                Barrel Length     Muzzle Velocity, 9"                           2,591                                     9"                           2,116, 10"                        2,689                                     10"                        2,173, 14"                        2,978                                     14"                        2,337, 16"                        3,083                                     16"                        2,397, 18"                        3,172                                     18"                        2,448. 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