I used 4 different ballistic softwares to see how they compared. The set up was muzzle velocity = 3200, BC = .508, bullet weight = 155, sight height = 1.7,zero = 100 yd, temp. = 59, barometric pressure = 29.53, relative humidity = 78. Results at 1000 yds 30 degree angle JBM bassistics -246.78 30=-213.9/-30=-209. Pointblank -247.78 not available Exbal -246.6 -206.9 Oehler demo -246.56 -211.56 Cosine of 30 degrees = .866 .866 x -246.8 = -213.73 .866 x -247.78 = -214.58 .866 x -246.6 = -213.56 .866 x -246.56 -213.52 I was surprised to see how close all 4 calculated the drop at 1000 yds with a spread of only 1.22 inches compared to a 7 inch spread in results at a 30 degree angle. I own the Exbal software and the other 3 can be used or downloaded from the web. I would like to see the results from other software that you might be using with a similar setup and comments on accuracy when dealing with angle shooting. For example Exbal only allows you to input 1 number for your degrees when shooting up or down hill and JBM allows you to put in the angle as being up or down. As you can see from the results above this gives you 3 different answers and the JBM method using the up angle comes closest to matching the answer given by multiplying the cosine of the angle by the drop at 1000 yds with 0 angle. Which method is more mathmatically correct ?