Titanium Nitride Bushing
Redding Titanium Nitride Neck Bushings are a hand polished heat treated steel insert which have an additional Titanium Nitride surface treatment to further increase hardness and reduce friction when neck sizing.
The Titanium Nitride Bushings have an external diameter of 12.7mm OD x 9.525mm long (1/2″ O.D. x 3/8″ long) and freely interchange in all Redding Bushing style Neck Sizing Dies. Redding Neck Bushings are available in .001″ size increments from .185″ through to .368″ covering all calibers from .17 to .338 and clearly marked with size I.D.
By selecting the correct bushing, you are now able to provide just the right amount of neck tension to properly hold the bullet without excessive resizing. To determine proper Bushing size, measure the outside neck diameter of a loaded cartridge with a precision micrometer, then subtract .001″ to allow for brass spring back and bullet tension.
Bushing Selection and Use
The easiest way to determine the proper diameter bushing, is to measure the neck diameter of several loaded or dummy cartridges with an accurate micrometer. Subtract .001”–.002” from the average neck diameter and this diameter bushing will generally size case necks to create the proper press fit for the bullet.
Another method is to measure the neck thickness with a ball micrometer or our Case Neck Gauge (see page 33). Double the neck wall thickness and add this number to the bullet diameter. The result is the neck diameter of a loaded cartridge, and bushing size can be determined as above.
After loading several cases, it’s a good idea to test the neck’s grip on the bullet. The simplest method is to push the bullet in a loaded cartridge against the edge of your reloading bench with moderate hand pressure. The bullet should not move easily in the case neck. If the bullet pushes deeper in the case, select the next smaller bushing and start again.
When using your bushing die, we have found that lubricating case necks and installing the bushing numbers down may improve results. Many experienced reloaders like to adjust the die to size 1/2 to 3/4 of the case neck. This has been shown to improve accuracy in most instances.
Final note: If you are not sorting case neck wall thickness for uniformity, we do not recommend the use of any bushing style die without a sizing button.