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Product no.: 749003411
Mfr. No.: 76301
611760763014 Heat treated steel bushings as above, but with the addition of a Titanium Nitride coating to further increase the effective surface hardness and reduce sizing friction. Bushings are available throughout the range of .185" thru .368" in .001" increments. The last three digits of the part (#RD76XXX) denotes bushing size. .185 to .252 .253 to .305 .306 to .368
Determining Redding Bushing Size
The proper bushing size can be easily determined by measuring the outside neck diameter of your loaded cartridges with a precision micrometer or a dial caliper. Then, simply subtract .001" from the cartridge that had the smallest average neck diameter. This diameter bushing will generally size case necks just enough to create the proper press fit for the bullet.
If you are using a Type “S” style die and not turning the outside of your case necks, we suggest using a bushing .002" smaller than your smallest average neck diameter, and using the expander ball included with your Type “S” die. This size bushing will still give you minimal sizing (maximizing the life of your brass) and the expander ball will insure that each cartridge has the same bullet grip.
Redding has found that when you have cases with neck wall thicknesses on the thin side of the SAAMI tolerance, your fired case will measure considerably larger (.006" to .010" larger) than your loaded rounds. In these circumstances, Redding’s tests have shown that a bushing .001" larger (than the loaded round) may give you the desired bullet grip.
Works For Me! 19/07/2014
I have been using Redding Titanium Nitride bushings ever since I began using Wilson neck sizing dies about ten years ago. The idea of using another brand of bushing does not ever come into consideration. When choosing the proper size I measure the neck diameter of a completed cartridge and deduct .002 inches. This seems to offer a good amount of bullet tension with a quality case such as Lapua or Norma. I use moly to lubricate the case neck before sizing on a clean case. These two factors (clean case and lube), in my opinion insure the die will be running strong long after I am not.
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