Hornady Lock-N-Load Concentricity Tool - Manual (Page 2)

Reloading is an enjoyable and rewarding hobby that is easily conducted with
safety. Carelessness or negligence can make any hobby, especially reloading,
hazardous. All Hornady® reloading tools and supplies are designed with the
user’s safety in mind. However, since Hornady® Mfg. Co. has no control over the
manner in which products or components are used in the reloading operation,
it cannot assume any liability for damage, which may result from the use of the
products or the information given herein. It is the responsibility of you, the user,
to follow generally accepted safety practices.
Use all reloading tools and supplies as the manufacturer recommends. Study
the instructions carefully and become thoroughly familiar with the operation of
those tools and supplies.
Observe good housekeeping in the reloading area. Keep all tools and supplies
neat, clean and orderly. Promptly clean up all primer and powder spills.
Know your components. Study manufacturers’ manuals to properly identify all
components and use them according to their recommendations.
Perform all tasks relative to reloading only when you can give it your com-
plete attention. Do not perform these activities when you are ill, fatigued, or
distracted. Develop a routine to avoid mistakes and haste.
Always wear eye protection. You assume reasonable risk during most reloading
related tasks and doing so without safety glasses is adding an unnecessary
additional risk.
Use only laboratory tested and approved reloading and component data and
reloading procedures. We highly recommend the Hornady® “Handbook of Car-
tridge Reloading” in its most current Edition as your source for the most modern
and current information.
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Operation
At this point you are ready to start inspecting and, if needed,
correcting cartridge concentricity.
Place a cartridge in the tool and rotate to indicate run-out.
Note: If the bullet spindle (5) rotates with cartridge, hold ball
knob (8) to keep it from rotating, as the cartridge MUST rotate
between stationary centers to deliver an accurate measure-
ment.
Set the dial indicator (4) to zero at the cartridges lowest setting
by loosening the dial indicator face lock (3) on the side of indi-
cator and rotating the face, or by loosening the dial indicator
lock screw (9) and adjusting the indicator in or out.
Straightening Cartridges
With the cartridge at its lowest point on the dial indicator (4),
bring the nylon-tipped thumbscrew (10) into contact with the
bullet applying pressure. Watch the indicator and take past the
cartridge’s high point on the dial indicator (4) and then release
the nylon-tipped thumbscrew (10). Re-measure concentric-
ity and repeat the process if necessary. The amount of force
required to correct the cartridge is determined by multiple
factors.
Best accuracy is generally achieved when cartridge concentric-
ity is no more than .002"-.003".