Gentlemen (and ladies):
I come to you from the world of International rifle shooting. I have become involved in learning why a .22 bullet, traveling at less than 1100 fps, does what it does in differing air densities. Specifically, we are attempting to decipher why flight stability (and hence group size) appears to improve when using "faster" ammo as the air density increases in response to altitude and/or barometric pressure, but slower ammo seems to improve groups when humidity goes up.
In other words, we think we have observed that the same ammo speed gives the best groups in a high or low DA independant of humidity; but once humidity rises, we see group size shrink by changing to slower ammo.
Please understand, I lied when I registered. -- Not an engineer of any type! But I am in the middle of this controversy and we need to know if there's an answer.
Is there something about humid air that changes flight stability in a decelerating projectile?
thank you!
Rifleman
I come to you from the world of International rifle shooting. I have become involved in learning why a .22 bullet, traveling at less than 1100 fps, does what it does in differing air densities. Specifically, we are attempting to decipher why flight stability (and hence group size) appears to improve when using "faster" ammo as the air density increases in response to altitude and/or barometric pressure, but slower ammo seems to improve groups when humidity goes up.
In other words, we think we have observed that the same ammo speed gives the best groups in a high or low DA independant of humidity; but once humidity rises, we see group size shrink by changing to slower ammo.
Please understand, I lied when I registered. -- Not an engineer of any type! But I am in the middle of this controversy and we need to know if there's an answer.
Is there something about humid air that changes flight stability in a decelerating projectile?
thank you!
Rifleman