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G7 Ballistics ?

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Old 03-14-2013, 08:28 PM
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Join Date: Jan 2012
Location: Bean Patch
Posts: 193
G7 Ballistics ?

When inputting a ballistic coeficient there are 2 different ratings a G1 and a G7. Which one should I use? I was loading the info for the SMK 155 palma #2156. Thier websight lists it as .504. When I compared identical info with JBM there was an inch and a half difference at 300 yards. I did notice that JBM changes it to .298 or something after you calculate for drop. What am I missing or messing up?
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