Dillon Precision Big-Fifty - Manual (Page 10)

PART# 29023 3/8/2010
10
PRIMING
The 50 BMG priming system is a departure from typical Dillon priming systems. It has been
our experience that a magazine of No. 35 primers is a very dangerous prospect due to
the comparatively massive amount of explosive contained therein. So we are
introducing our 50 BMG “Top of Toolhead” primer seater. This configuration allows for easy
access for manual “one at a time” loading of primers, while taking full advantage of the
final cam portion of the stroke to seat the primer.
Primer Punch options
Included with your priming system are two styles of primer seat punches, a concave and
flat-surfaced punch. The concave punch is used for the majority of 50 BMG applications
providing excellent seating and support of the primer cup, while preventing any “pre-
crush” on the primer anvil. In high-accuracy or bench-rest style applications, a flat punch
may be used, with increased caution, where you may find having “pre-crush” is desirable
for decreasing lock time for match type applications.
Adjusting your primer seater
The primer seat is threaded 1½”-12 UNF to function as a die in the tool head. It operated
by making contact with the shellplate platform, to seat the primer, and resetting with the
spring-loaded punch.
To adjust:
1. Move the handle down to raise the platform.
2. Screw the Primer seater die into the desired station of your reloader. Continue screwing
in, after it has made contact with the platform, until the punch face is flush with the floor
primer seater shell holder.
3. Adjust the orientation of the shell holder slot as desired, and then snug the lock ring and
its set screws to set this position.
4. Once set, use the fine adjustment knob that contacts the platform, to set the final
depth of the primer punch.
5. Tighten the two set screws and the jam nut to lock the adjustment screw.