Redding Neck Sizing Bushings are freely interchange in all Redding
Bushing type Neck Sizing Dies. 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. Made of heat
treated steel. The sizing diameters are hand-polished with a surface
hardness of Rc 60-62 to reduce sizing effort. The proper bushing size
can be easily determined by measuring the outside neck diameter of your
loaded cartridges with a precision micrometer. Then, simply subtract
.001" from the cartridge that had the smallest average neck diameter.
Moly coated bullets may require tighter necks and the use of bushings
.001” or .002” smaller.