![]() Therefore if you were sighted in at 300 yards and your target were a one inch circle, then the Max PBR would be 300 yards, since that is the maximum distance at which "the bullet in fight is expected to strike the target without adjusting the elevation of the firearm." If you define your target as a 6" circle, then I suppose you could be 3" high at the Minimum Point Blank Range and 3" low at the Maximum Point Blank Range, but the Wikidefinition seems to imply that Point Blank Range depends on the definition of the target. A firearm with a flatter trajectory will permit a nearer minimum and further maximum point blank range for a given target size, while a larger target will allow for a longer point blank range for a given firearm. The point-blank range will vary with the firearm and its particular ballistic characteristics, as well as the target chosen. Wikipedia (whatever you think of its veracity) defines Point Blank Range as, ".the distance between a firearm and a target of a given size such that the bullet in flight is expected to strike the target without adjusting the elevation of the firearm. I don't know where the 3" criteria comes from or more exactly, why use a 3" criteria. To me MPBR is a pretty interesting concept. This would obviously change for handloads, and maybe someone who has done some handloads and has some good stats on velocity and trajectory for them could add what their MPBR is. So just looking at the factory information for the 250 grain hornady ammo (2200 ft/sec, BC=.210):Īnd playing with the zero in range, if you sight in at 172 yards you'll be 2.9 inches high at 100, and 2.9 inches low at 200. ![]() Thus between the muzzle and the distance given as the MPBR, the bullet never strays more than 3 inches above or below the line of sight." the distance at which the bullet falls 3 inches below the line of sight. Here's the quick reference: "The Maximum Point Blank Range (MPBR). Specifically related to what I've read from Chuck Hawks on MPBR (Maximum Point Blank Range). Because I've got a few free minute over lunch today I wanted to get some discussion going on sighting in the 450.
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