I got this from the Dillon manual:
The machine comes with two primer pickup tubes
(#20060 large, #20059 small) and two primer magazine tubes
(#22031 large, #22030 small). They are color coded for easier
identification. See color coding information below. The large
ones should be used together and the small ones should be
used together.
You will notice that the primer magazines and primer
pick-up tubes have different colored tips. They have been
color coded to help you identify size more easily.
The color code is as follows:
Blue Small Primer Magazine Orifice
Red Large Primer Magazine Orifice
Yellow Small Primer Pick-up Tube
Green Large Primer Pick-up Tube
And this on troubleshooting the primer system:
Problem 3. Primer jams or misfeeds.
A. Primer misfeeds can be caused by misadjustment of
the set screw (#13961) in the primer feed block, Fig. 12.
B. The most common cause of primer misfeeds or jams is
the primer punch not seated fully into the primer slide. This
will cause the primer seating cup to strike the flexible orifice
on the bottom of the primer magazine tube. See the
photograph on page 5 for adjustment tolerances.
WARNING: If the primers are jammed and will not feed
from the bottom of the primer magazine, DO NOT
ATTEMPT TO FORCE THE PRIMERS OR THE PRIMER
SLIDE. Never force primers in any situation, an explosion
resulting in injury can occur.
C. Another common problem is that the primer slide fails
to return fully forward with the new primer. Periodically
wipe the primer slide with rubbing alcohol. This removes the
spent primer residue that causes the slide to drag.
Hope this helps.