online ballistic charts

[Ultramag45]

Looking for the most accurate online ballistic chart, to make several drop tables.... Looked at the Jbm, and the externalballistcs calculator.... both are different.... any other good ones out there.. these 2 look but it is kinda hard to figure which is right.... I know where my rifle shoots, just looking for info at different altitudes to get my dials lined out... thanks guysgun)

 

[MontanaRifleman]

This is just my guess, but the JBM is probably the best. To use it accurately you will have to actually shoot at longer ranges and compare your drops with your MV's to figure your actuall BC's. Your BC will likely change at different ranges, such as 500 yds vs 800 yds vs 1000 yds etc.

-MR