Thread: Hornady online 4 DOF solver

Interesting. For the few bullets that I've checked, a reasonable match can be found between the 4DOF drops and some of the others (Applied Ballistics & JBM trajectory) but not if the Hornady G7BCs are used as-published. These appear to need to be backed off a tad to get a match.
It seems odd that Hornady would publish BCs knowing that when used with these other calculators there will be an obvious discrepancy with their own measurements that come out of the 4DOF calculator. Now that they have an alternative non-BC based simulator where else are their BC figures going to be used?
The few coefficients I have arrived at using the Labradar - using the oppositions products mentioned above - oddly enough support the Hornady G7BCs, but these are only from data within the first 100 metres. An example might be the 0.326 G7BC for the 140gr ELD-M in 6.5mm. There is a better match between the simulators out to a 1000 metres if a figure around 0.320 is used.
The impression is that for bullets with the very lowest form factors the G7BCs drops off very slightly as velocity is shed - as occurs more noticeably if the G1 model is used.