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When a particular projectile has a sub 1 form factor i this indicates that the particular projectile exhibits lower drag than the applied reference projectile shape. Siacci wrote that within any restricted zone, C being the same for two or more projectiles, the trajectories differences will be minor. Following within today's currently used ballistic trajectory tables for an average ballistic coeficient: Variations in BC claims for exactly the same projectiles can be explained by differences in the ambient air density used to compute specific values or differing range-speed measurements on which the stated G1 BC averages are based.

### Ballistic Coefficient Estimator

Click here to bookmark this site. Mayevski, then a Colonel — at St. These measurements must also be made and the results entered into the coefifcient space in the calculator. It's hard to see from the picture above, but easier to see in pistol rounds. Inthe Electro-ballistic chronograph was invented and by the electro-ballistic chronograph was accurate to within one ten millionth of a second.

They were deduced from Bashforth's experiments by Professor A. Vehicles that carry nuclear weapons launched by an intercontinental ballistic missile ICBMby contrast, have calculatoor high ballistic coefficient, which enables them to travel rapidly from space to a target on land. Ballistics is the science of mechanics behind projectile flight, behavior of objects during un-powered trajectories, and the effects of projectiles.

## Ballistic coefficient

The boattail hollow point combines the airodynamics of the boattail with the expansion of the coefficietn point. Measurements on other bullets can give totally different results.

Brian Litz, ballistic engineer for Berger Bullets, LLC for calculating boat tailed spitzer rifle bullet trajectories and 6 Dof model based software have improved the prediction of flat-fire trajectories. Measure the diameter of this hemisphere where it joins the radius curve, as shown, and enter this value as the Tip Diameter. Therefore, a single trajectory can be computed for the standard projectile without having to resort to tedious calculus methods, and then a trajectory for any actual bullet with known C can be computed from the standard trajectory with just simple algebra.

Since that is not always possible, some means other than an educated guess is needed to estimate a reasonably accurate calculztor and trajectory package. However this method is not nearly as accurate as a precision measurement. Go to the Estimator.

Also, the newer methodology proposed by Dr. Add your email and we will get back to you about your request.

### Ballistic Coefficient

The initial velocity V 0and then, at a certain point on the trajectory at the distance x from the muzzle, the V x velocity.

Precision Ballistics and Records Software Home. The Spitzer is a very popular and aerodynamic bullet shape. It therefore has a lower BC modifier than the spitzer boattail, but a ballistiv higher modifier than the standard Hollow Point somewhere around 1.

Understanding Firearm Ballistics; 3rd Edition. The resulting drag curve models for several standard projectile shapes or types are referred to as:.

Sporting bullets, with a calibre d ranging from 4. The Boattail hollow point has a much lower BC modifier of somewhere around 1.

It would be found that air does not deflect off the front of a projectile in the same direction, when there are of differing shapes.

## Ballistic coefficient calculation

The normal shooting or aerodynamics enthusiast, however, has no access to such expensive professional measurement devices. These ballistic tables were published in and almost identical to those of Ingalls. Brassey's Land Warfare Series: Most ballistic calculators require that the bullet be laid upon a chart of different profiles such as the Coxe-Bugless Chart in order to find a curve that most closely matches the curve of the ogive of the bullet.

The Ballistic Coefficient of tangential ogive jacketed bullets traveling at velocities above the speed of sound can be calculated calcupator a reasonable degree of accuracy if careful measurements are made to determine the actual radius curve of the nose portion and the boat tail if any dimensions. It will be very close to the point where the bullet body ends and becomes the start of the bullet nose.

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