.22 AEA .22, 21.9 grain ballistic coefficient

[NAProf]

@BBGunn, I don't want to come across as a dick, but pellets use GA and conventional slugs use G1, usually. I have no way of knowing who knows what, or if it was a typo, but I just thought you and anyone following might benefit knowing that. I do the same thing as you. I shoot at different distances and see what's actually happening and back calculate using Strelok Pro and I get really useful numbers to me.

Hi,
I have also heard that GA standard model is better for pellets than the G1 standard model. Maybe that is because whoever developed the standard was using pellets to come up with it.

However, I have managed to get the data points for many of the standard curves of interest to airgun shooters (from Strelok Pro) and the graph below shows all those curves in the subsonic range. Please note that for each I put a marker on the data points and then did a cubic spline curve fit to those points.

Below 1100 fps (the sub-sonic region) the GA and G1 curves are hardly different. The height doesn't really matter, it is the shape that counts. BC uses the ratio of the CD for your projectile to the CD of the standard model to essentially shift the standard model shape up. The height of the "adjusted standard" CD curve is determined by the BC value at the specified velocity and the sectional density. Air density (temperature, barometric pressure and humidity) only come into play when calculating the projectile path.

So, I don't believe it really matters which one you use. The sensitivity of you projectiles path to BC is not that great, particularily when you look at all the other variables that go into the pellet flight.

Cheers,
Greg

 

[Solo1]

This was today shooting the 50 yd comp with aea 21.9

 

[duchunter007]

This was today shooting the 50 yd comp with aea 21.9
View attachment 23048

how do you like the new chrono?