Re: Online seminar on Field Firing Solutions
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">No the G7 is not used. There are no plans to do so, since the industry has settled on providing G1's. With the tuning ability provided by the DK calculator, there does not appear to be a need to improve the solution.</div></div>
A G7 drag model with a accurate G7 BC seems to be a bit better at predicting terminal velocity at longer ranges.
When you compute a DK based on your long range data and the new DK is different from 0.5, the program does not change either the predicted terminal velocity nor the time of flight to reflect that change, although it does, of course, change the elevation calculation.
On the other hand, if you change the BC of the bullet until the program predicted elevation matches your field shooting data, the program does change both the terminal velocity and the time of flight.
For that reason, I'd recommend changing the BC of the bullet rather than using the DK, if having a more accurate terminal velocity is of importance.
And it may not be.
Many bullets handle the transition from supersonic flight to subsonic fairly gracefully, and probably military snipers contemplating a shot at a range which is close to the maximum supersonic range of the bullet are going to make the decision to shoot or not based upon operational requirements rather than upon that maximum supersonic range.
And that's probably as it should be.
Personally, I've found that using Brian Litz's tested G1 BC rather than the manufacturer's BC in Field Firing Solutions with a 0.5 DK, produces results which are essentially indistinguishable from those produced by a good G7 drag model also using Brian's G7 BC.
And that's what I'd recommend.
