to find tang setting sight in at 100 yards.. lets say as on my rifle its 20 inches or moa.. divide 1000 yards drop by 10 thats 190 inches add 20 and that would be aprox 210 setting on my gun if statistics are entered right.. but i doubt they are. they change daily, and temp, wind, humidity eleveatioin, all make a difference.. as stated by sharps 45-90 the balistics coeficient will be highre with the heavier bullet and you will actually have less drop at 1150 fps, which may be more accurate in bp gun. . its just an idea that would be aproximate.. dave..
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