On the Auto Breech Lock Pro, rotation of the shell plate is in the
clockwise direction. So the order of the dies are sizing at position one
where the case first enters the shell plate, then the powder die to the
left of the sizing die (position 2), then the seating die (3) and
finally the crimp die at station 4.
A progressive press has a rotating shell plate with multiple shell slots. If the sizing die is
installed just to contact with the shell plate, cartridge overall length
(COL) can vary with the number of cases on the shell plate. With a full
shell plate, COL will tend to be longer because the increased pressure on
the plate from dies pushing on 4 cases/cartridges keeps the plate from
rising as high as it would with just one case on the shell plate.
Installing the sizing die 1/3 turn (.024" deeper if you do the math)
past contact with the shell plate, eliminates this COL variation because
the shell plate stops on the sizing die not when the press mechanism
hits the built in stops in the linkage.
If you are using a crimp die in the fourth position, then you will want to set up the seating die
to seat the bullet only without crimping. The quick and easy way to do
this is to have a sized and expanded case in position 3 on the shell
plate, Hold the press lever down as far as it will go with one hand and
turn the seating die down over the case with your other hand until the
die stops. The die will stop when it contacts the case mouth. Now back
the die away from the case 1/4 turn and lock the die down. The bullet
seating adjustment screw at the top of the seating die can then be used
to establish the desired bullet seating depth (COL).
If you have the carbide factory crimp die for a pistol caliber the die should be
installed to contact with the shell plate. The the crimp is adjusted by
means of the adjustment screw at the top of the die. Begin by backing
the screw out until threads show. To acquire the start position for the
adjustment screw raise a cartridge that has not been crimped into the
crimp die. Hold the press lever down as far as it will go with one hand
and with the other hand turn the adjustment screw into the die (toward
the shell plate) until the screw stops. Lower the cartridge 1/4 inch and
turn the adjustment screw into the die 1/2 turn. Push down on the press
lever to crimp the cartridge. If a heavier crimp is desired turn the
screw toward the shell plate. For a lighter crimp back the screw away.
If you are using a collet style crimp die then here is how to set it up.
Hold the press lever down as far as it will go with one hand and turn
the die into the press with your other hand until the die makes firm
contact with the shell plate. lower the shell plate 1/4 inch and turn
the die into the press (toward the shell plate) 1/2 turn. This will
yield a moderate crimp. For a heavier crimp adjust the die toward the
shell plate. For a lighter crimp back the die away from the shell plate a
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