JBM is an excellent program and easy to use if you feed it correctly ie - velocity -projectile BC , USE g7 although that wont matter g1 or g7 at distances under 600 yards to much -scope height - use an average temp and say 500 feet in altitude and you shouldnt be to far off .Very important though to get you velocity sorted out and if you come as invited for a shoot I can sort that stuff for you quick smart .
If you have an Iphone down load the JBM programe or ballistic FTE -If you have an android phone get Bryan Litz programe
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