Dillon Precision Super 1050 - Manual (Page 17)

on the case mouth without falling off
and to keep the case from shaving lead
during the seating process - see the
illustration (above) example “B”.
Note: If you screw the die down too
far, the case will look like example "C"
in the illustration (right). You must then
discard this case, back the powder die
off, by turning it counter clockwise, and
continue with a new sized case.
You’ll soon learn to judge the correct
amount of bell by simply looking at it. In
the meantime, you might want to use
your dial calipers to check it. Twenty
thousandths of an inch greater (at the
mouth of the case) than its original
diameter, should about do it.
Once you’ve achieved the desired
amount of bell – with the case in Station
5, raise the toolhead. Run the lock ring
down hand tight.
Insure the bellcrank and the return rod
bolt (in the frame) FIG 54 are aligned.
Using a 5/32" Allen wrench, snug the
collar clamp screws.
While holding the powder measure in
place, snug the lock ring using a 1-1/8”
wrench.
Station 7 - General Information on
Bullet Seating
The purpose of the seating die is to
insert the bullet into the case and to push
it down into the case the proper amount.
How far the bullet is pushed into the
case will determine the overall length
(OAL). Several factors go into determin-
ing the proper OAL – such as, the maxi-
mum recommended OAL, listed in the
reloading manual, and the type of bul-
let being loaded. The type of bullet can
determine the OAL in one of two ways.
If the bullet has what is called a can-
nelure, or crimping groove Fig. 55 &
56, this will determine the proper OAL.
If the bullet you’re using doesn’t have a
cannelure or a crimping groove, then
you’ll need to refer to your reloading
manual for the suggested OAL. The pur-
pose of the cannelure and crimping
groove is to secure the bullet by giving
the mouth of the case a place to go
(without deforming the bullet) when
being crimped. When the bullet is
properly seated, the mouth of the car-
tridge case should be near the top of
the cannelure/crimping groove.
Refer to your reloading manual.
Under the section specified for the cal-
iber you’re loading, you’ll find a
schematic of the cartridge. For example,
.38 Special lists a maximum OAL of
1.55" (Lyman Reloading Handbook). If
you’re seating the bullet to the can-
nelure/crimping groove, the OAL should
be well within the maximum OAL listed,
however, use a set of dial calipers to
check it. (Dial calipers are available from
Dillon Precision). If the bullet you’re
using doesn’t have a cannelure/crimping
groove, refer to the specific type of bul-
let you’re using in the reloading manual.
For example – if you’re loading a 158 gr.
.38 Sp. JHP and it doesn’t have a can-
nelure/ crimping groove, use the suggest-
ed OAL of 1.480 (Lyman Reloading
Handbook).
Station 7 - Installation and Adjustment
of the Seating Die
Take the seating die from the die box
and screw it into Station 7. Screw the
die down until the bottom of the die is
flush with the bottom of the toolhead.
Note: At this point the die will not be
screwed down far enough to begin seat-
17
Fig. 55 & 56 - Shown are several examples
of a cannelure or crimping groove.
Fig. 54 - Make sure the bellcrank and return
rod bolt are aligned.
Figure 64
Figure 70
Figure 114
Please note that every die set includes
seating stems to fit most common bullet
types. Select the appropriate seating stem
for the bullet type you are loading.
Fig. 57 - Place the bullet on the case
mouth at Station 7.
Super 1050, May 2007 5/21/07 12:00 PM Page 17