Brownells Sinclair 749-007-637 Manual

200 South Front Street • Montezuma, IA 50171 • 800-717-8211
260-482-3670 • www.sinclairintl.com • support@sinclairintl.com
Congratulations! You have purchased another fine Sinclair Reloading Product. Please take a few
minutes to read the following instructions for the use and maintenance of your new Arbor Press.
The Sinclair Arbor Press is designed specifically for use with L.E. Wilson
neck sizing and bullet seating dies. This press will provide the user with
a lifetime of use if it is used and maintained properly.
- It is absolutely not designed for use in any type of full length
or body sizing.
- It is not designed for swaging bullets.
The Sinclair Arbor Press has a stainless steel rack and pinion mecha-
nism inside the head. When used with proper dies and bushings the
gear ratio of the press only requires the user to use minimal force on the
handle to perform routine neck sizing or bullet seating operations. If you
have to exert an extreme amount of force on the handle, then something
is wrong with the operation and you will potentially damage the gear
mechanism.
If you meet with considerable resistance when sizing a case, the
problem can be narrowed down to the following two causes:
1) Your rifle's chamber is oversized (usually at the base). When this
situation occurs, your fired brass can be fire formed beyond
SAMMI specifications. When you try to press this brass into a
Wilson neck sizing die, you actually begin to size the body of the case.
Prevention Suggestion: To prevent this problem, try inserting a fired case into your Wilson dies
(without the bushing installed in the neck sizer). The case should slip into the die with no
resistance. If your fired case does not slip into the die(s) in a similar fashion as described, we
recommend first cleaning and degreasing the die. If your fired cases still do not slip into the die
we recommend sending the die(s) to Wilson as prescribed in the instructions included with all
Wilson dies. The other option is to switch to using 7/8-14 threaded dies. If you switch to a
full-length die watch for signs of excessive case stretching.
2) You may have selected a bushing that is too small. If this is the case you will experience difficulty
in pushing the case down into the die. This causes a few problems: 1) it puts too much stress on
the Arbor Press, 2) you are potentially causing a pressure increase in your chamber, 3) you are
probably shaving off part of the bullet jacket material when you seat bullets into this tight of a neck,
and 4) this much neck tension is probably not doing any thing but hurting your overall accuracy.
This same problem can exist if you are neck turning cases for a factory chamber and removing an
excessive amount of brass from the neck. Cases that have been turned down too much have to
Sinclair Arbor Press
TM
#749-007-637