Sight/bullet trajectory intercept equation.

H

HitmanNumber86

Inactive
Any ballistics nuts know how to calculate the intercept points of a bullet trajectory with the sight allignment?

As best I recall from the MC, all things being equal, an m855 ball from an AR15 set to 200 yds, will intercept the sight line at 12yds and 200yds. We'd shoot at 12 to BZO new rifles. Then we'd never have to touch the front sight post again.

Does anyone know of an equation, to calculate the intercept points of a rifle? If so, I can try to write a script to calculate it, for anyone else who wonders.





PS: Why is there no ballistics topic on this forum?
 
I thought the battle sight zero for the AR-15 was 25 meters for a 200 meter zero.

Irrespective of that specific example, I don't think there is a formula -- or, if there is, it would be too complicated for me to figure out, and I was a math/physics major in college.

Variables:
----------

Sight height relative to bore axis
Sight radius
Barrel length
Bullet velocity
Ballistic coefficient of bullet
Distance to selected zero
 
PS: Why is there no ballistics topic on this forum?
Click to expand...

My guess is because nearly everyone on here has and uses 1 or more types of ballistic software programs, which answers all of those questions about all chamberings and loads, and many other questions, pretty simply and easily.

Not being a smart alek - just telling you the real deal. People do ask very specific questions sometimes, like you did.

But these days, (a) there are several free downloadable ballistic programs online, (b) there are several free non-downloadable ballistic programs/calculators online, (c) there are many free apps for both android and apple (and probably for blackberry and microsoft too) for ballistics, and (d) there are many paid apps for those "eco-systems" as well.

https://www.google.com/webhp?source...=1&espv=2&ie=UTF-8#q=free ballistics software
 
HitmanNumber86, welcome to TFL.

PS: Why is there no ballistics topic on this forum?
Click to expand...

If you check out the rifle forums, you'll find quite a few threads on the subject; ballistics does, mostly, fall under "The Art of the Rifle." :)
 
back in the day (1975) we "battle sight zero'd" our M16A1s at 25 meters with the standard 55gr ball (M193?).

Using special "sighting in" targets (I no longer remember the official name), when zero'd so that the bullet impact was where the "x" was, (a couple inches BELOW the aiming point), we were told we were zero'd for 250 meters.

Aiming for the head did knock down the 250 meter silhouette. But, to knock down the 300 meter one, I had to aim a half target height above it.


Why is there no dedicated Ballisitics Forum on TFL? Space (the final frontier;)) is probably the main reason, but also, ballistic questions are most often very specific to the gun and load, and so best handled in the forum about that gun, or load.
 
Damn, I never thought to Google ballistic calculator. I just kept looking for equations.

I guess I was wrong about the BZO distance. It just seemed much closer in my head.

I think at least a terminal ballistic page would be nice. You could call it WWI, 'cus that endless horrifying battle will never end. A constant slow struggle to say this load is better 'cus...

Thank you very much for your responses. I got a 91/30 with a very clean barrel. I'm turing it into a project to make into a 500 yard gun, maybe 1000yds, from what I've seen on YouTube. I just need to find a place to shoot at that range.
 
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