SW,PBR means point blank range. Its the farthest distance you can shoot while aiming at one point and still get a kill with in a predetermined point of impact. For example. A kill zone of six inches on a deer when shooting my 300 win mag has a PBR of 325 yards. This means that if I aim dead on in the six inch circle the deer can be up to 325 yards and I will get a good hit from zero to 325 yards. Out side of the PBR I will have to give it kentucky windage or hold over. Hehehehe I beat you all to it! LOL!!!!