RCBS Gold Medal Dies - Manual (Page 9)

The amount of the
case neck that is
resized is adjustable
by adjusting the
Neck Bushing retain-
er upwards. This
allows the Neck
Bushing to move
upwards before neck
resizing begins. A full
turn is approximately
.0712", this creates a
double diameter
neck with the base of
the case neck further
helping to center the
cartridge in the
chamber of the
firearm.
NECK RESIZ-
ING
The Gold Medal Neck Sizing die only resizes the neck of
the case. It does not touch the body of the case or change
headspace. Follow the directions of the Full Length Sizer
die for proper use. After multiple firings using the Neck only
sizer die, it may be necessary to set headspace back a
few thousandths to allow chambering. This can be done
with the Gold Medal Full Length Sizer die with the neck
bushing removed.
“BUMPING” HEADSPACE
Bumping headspace is exactly what it sounds like, you
are simply bumping the shoulder(headspace) back to
allow the case to chamber into your firearm. The use of
the RCBS Precision Mic or other quality gauges will help
you to set headspace exactly to your firearm.
(Photo 2)