Ballistics software and specific ballistics question

F

Futo Inu

New member
Does anyone know of a link for downloadable application for external ballistics, either free or low cost (<$20)?

Specifically, I am wondering, for a 140 gr, 6.5mm bullet, with a ballistic coefficient of .496 (.5) (sectional density is .289), with a MV of 2600, if I want a 200 yard zero, where (how high) should the bullet hit the target at the 30-yard indoor range? I can see from Speer's long-range tables that the bullet is 2.2 inches high at 100 yards, so it should be between 1/4 inch to 1 inch or so high at 30 yards, but I don't have any software to tell me the exact number. TIA. Or just what would the formula be for to backtrack to this answer?
 
Thanks Mal and Don

The top of the front sight appears to be just 0.80" from the center of the bore. I guess it would make a difference at this short of a range, wouldn't it, when you're talking about just 2/10ths. Mal, do you you know whether your calculation presumes a higher sightline (like 1.5")?
 
Iron sights zeroed at 200 yards, eh? Well, Quigley, let me redo the calculation. ;) I did assume a 1.5" height for a scope.

Hang on...

Done! (Pretty fast, wasn't it?)

That made quite a difference. The rise at 30 is 0.78".
 
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