Got a question.

[lenweber2]

Any one have a calculator for .22

18.13 JSB at 45° 250' elevation shooting 880 FPS

AND 

Hades 16 gr at 45° 250' elevation shooting 930 FPS



What about at 4620' elevation at 50•-60° speed?

 

[Raider03]

Download Hawke Chairgun App or Strelok Ballistic Calculator App from the Goole Play Store to an Android device. You can look up the pellet BC at https://hardairmagazine.com/ballistic-coefficients.
Chairgun should have the JSB 18.1 grain info in its library. You will need also provided info on the distance from the center of the scope to the center of the bore and the zero distance. 

 

[lenweber2]

Will try.

 

[lenweber2]

Can't find a velosity calculator for temp and elevation in either app. Am I dense?

 

[dannya1a]

in chairgun the temp is in the lower right corner of the upper tab section. Chairgun doesn't deal with elevation at all. it has temp and barometric pressure.

 

[Raider03]

Barometric pressure (BP) is the correct term, as you go up in elevation barometric pressure drops.
You can use an estimate of 1 inch of Mercury for every 1000ft of altitude. Nominal air pressure at sea level is 29.95 inches. For example, at 5000ft that would be about 24.95 in. Weather conditions can change barometric pressure some. If you want the most accuracy for your current conditions then you will need something like a Kestrel 5700. Also these calculators use a constant value for the pellet BC, which isn't the case. BC varies with pellet speed. 

 

[lenweber2]

Ok didnt think about pressure duh. And im a pilot sheesh.

 

[ShootAssist]

It is good to calc BC for you own rifle (barrel) and local atmosphere (temperature, preassure).

Don't forget chose correct drag funcion.

I use ShootAssist for all ballistic calculation.

 

[Raider03]

Hi,

You might be interested in Matt Dubber's you-tube channel. He has a 10 part series on Airgun Ballistics and much more. This link is for Part 1 https://www.youtube.com/watch?v=G1z4auc9hmE&list=PLJtIBVn6GmaTSkPSH96Vy7HWEdWO9iexY&index=2&t=0s

The only dumb question is the one you didn't ask...