testtest

TWIST RATE AND DO YOU HAVE IT CORRECT

I've been comparing the difference between Greenhill and Miller's and will have too go with Miller on this one. Your combination of bullet, velocity and twist rate might not be what and where you need it? Reloading or factory and possibly not stabilized? Miller's adds bmap, altitude and temperature to the equation. Hopefully this link will help?
 
I've been comparing the difference between Greenhill and Miller's and will have too go with Miller on this one. Your combination of bullet, velocity and twist rate might not be what and where you need it? Reloading or factory and possibly not stabilized? Miller's adds bmap, altitude and temperature to the equation. Hopefully this link will help?
When talking about ballistics, the Coriolis Effect refers to the deflection on the trajectory of the bullet generated by the spinning motion of the Earth. ... When an object flies eastward, in the same direction of Earth's rotation, centrifugal force acts opposite of gravity, pushing it away from the Earth's surface.
 
If you're into long range shooting, its important to understand how the “Coriolis effect” affects your shot at 1000 yards or greater. The Coriolis effect is the rotation of the earth and the movement of a target downrange from the shooter.
 
Accounting for the planet's rotation depends on the direction of the target. If it's easterly, the bullet will land higher than the shooter aimed. If the target is westerly, the bullet will shoot low. If you shoot straight north or south, where the axes of the Earth are, there will be no effect at all.
 
where Fc = Coriolis effect, V = wind velocity, A = angular velocity of the earth, and l = latitude. Based on this equation, magnitude of the Coriolis effect at the poles “is equal to twice the product of wind velocity, V, and the angular velocity of the earth, A” (Battan, 1961, p. 46).
 
In ballistics, the ballistic coefficient of a body is a measure of its ability to overcome air resistance in flight. It is inversely proportional to the negative acceleration: a high number indicates a low negative acceleration—the drag on the body is small in proportion to its mass.

Take the .308 for example The stats are generated using a 150gr FMJ Boat-Tail with a ballistic coefficient of . 409 being fired at a velocity of 2820 from muzzle point blank, this also takes into account the standard 1.5" scope height, and a gun that has been sighted in at 100 yards.
 
G1 vs. G7 Ballistic Coefficients — Which Is Right for You? G1 and G7 refer both refer to aerodynamic drag models based on particular “standard projectile” shapes. ... So, when choosing your drag model, G1 is preferrable for flat-based bullets, while G7 is ordinarily a “better fit” for longer, boat-tailed bullets.
 
Giving any facts this statement holds true, "Nothing will be exact, but being incorrect will be greater"! You can't account for everything, just what's in your face! Down range anything/everything can/could happen! This is not a debate on distance, just a statement on having the correct or close enough twist rate for the ammo choice! Take it face value and nothing more! This is off topic for your post. Try another, thanks!
 
Mathematically, it is the ratio of a bullet's sectional density to its coefficient of form. Ballistic Coefficient is essentially a measure of air drag. The higher the number the less drag, and the more efficiently the bullet cuts through the air.
Ballistics. The formula for calculating the ballistic coefficient for small and large arms projectiles only is as follows: ... d = measured cross section (diameter) of projectile. i = Coefficient of form.
https://www.vcalc.com/wiki/vCalc/Ballistic+Coefficient
 
Mathematically, it is the ratio of a bullet's sectional density to its coefficient of form. Ballistic Coefficient is essentially a measure of air drag. The higher the number the less drag, and the more efficiently the bullet cuts through the air.
Ballistics. The formula for calculating the ballistic coefficient for small and large arms projectiles only is as follows: ... d = measured cross section (diameter) of projectile. i = Coefficient of form.
https://www.vcalc.com/wiki/vCalc/Ballistic+Coefficient
Thanks for the bc input! I will be doing more research, thanks!
 
Back
Top