Night Vision Free ballistics program - useful for prediction.

[cj7hawk]

Hi all,

I have recently downloaded and had a play with Chairgun - it's a free program you can get from the people who make the scopes and it will provide some useful information for every different configuration -

The ED ( Effective Deterioration ) is the ballistic co-efficient, which can be looked up. It's about .13 for 55gn 3000 fps .223 as an approximation but you can probably get accurate data for any cartridge and you can tweak it which makes it very accurate.

It is designed for Airguns, btw, so has some limits, eg, 3000 fps muzzle velocity - but it's still useful for a general idea of how your bullet will rise/drop after firing and what different it will make if you mount your scope higher or lower, add a laser above or below the barrel and will tell you where your zero'ed "Kill Zone" is.

Anyway, it's free and is fun to play with - seems to require administrator mode on my machine the first time it ran to set up, but afterwards ran fine every time. If you're using subs or any other low-velocity ammunition, you will find it exceptionally useful.

http://www.hawkeoptics.com/apps/brc.html

It takes a bit of playing, but once you turn the laser on, it's great for working out what range you should sight in your rifle at to get the most out of the flatter part of the curve and helps with the decision on mount height.

This is especially useful for NV scopes, as our scope axis tends to be a LOT higher than normal scopes.

Regards
David

 

[hrt4me]

Re: Free ballistics program - useful for prediction.

thanks