What is bullet concentricity?

What is bullet concentricity?

The term “concentricity” is derived from “concentric circle”. In simple terms it’s the issue of having the outside of the cartridge in a concentric circle around the center. That goes from case head and center of the flash hole, to the tip of the bullet.

What is a concentricity gauge used for?

The Concentricity Gauge measures the internal and external neck runout of your cartridge case as well as seated bullet runout. It can also measure the runout of the ogive, bearing surface and boat-tail of individual bullets and can even measure your primer pocket runout.

What is bullet run out?

Run-out can be described as how much the entire loaded round is out of a true straight line from center point on the case head to the point of the bullet. Run-Out is more formally known as concentricity of an object.

Does concentricity affect accuracy?

Without a doubt, concentricity—or, rather, the lack of it—has the potential to affect accuracy.

How does copper fouling affect accuracy?

Copper, smeared on steel, can corrode the steel if there’s moisture present. This creates pits, which do a superior job of gouging jackets as bullets pass over them. Very often, a copper-fouled barrel will shoot OK until it’s cleaned, and then it won’t shoot worth a damn.

What is the difference between concentricity and runout?

While concentricity looks at how well a cylindrical feature is centered on a theoretical axis, runout looks at how much the feature deviates from a perfect circle that is perfectly centered on an axis of rotation.

What is a concentricity tool?

Hornady Lock-N-Load Concentricity Tool. This tool identifies and eliminates bullet runout (or wobble). Just place ammunition in the tool, roll it, identify runout and use the dial indicator thumbscrew to adjust. Features Universal centers ensure precise alignment of most bottleneck cartridges from 22 cal up to 45 cal.

Does Hoppes 9 remove copper?

Hoppe’s No. 9 Bench Rest Solvent is an order of magnitude above Hoppe’s original No. 9 in removing copper fouling, and also takes care of all the other crud normally found in a bore.

Should you remove copper fouling?

Most rifles shoot well with some copper and/or powder fouling. Some rifles need some fouling to shoot their best. Copper and/or powder fouling can build up to levels that affect accuracy, however, and so the fouling must occasionally be cleaned from the barrel.

How do you check concentricity manually?

Using a Coordinate Measuring Machine (CMM) Put the stylus on the measurement point on the datum circle, and then put the stylus on the measurement point on the target circle to measure the concentricity. The stylus only comes into light contact with the surface and does not scratch the target.