Dillon Precision Products RL550C, Assembly And User Instructions Manual

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Rifle Crimping--Rifle bottleneck cases, in general, are not crimped unless the bullet has a cannelure and the
COAL corresponds with that position as below. Taper crimp the case mouth only enough to straighten out any
belling. An autoloaded rifle cartridge might require a crimp (no more than .001”-.002”) if the neck tension on
the bullet is inadequate to hold the bullet in place during the auto-loading cycle of semiautomatic firearms.
8.6.8 Adjustment of the Bottleneck Crimp Die
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Screw the Crimp Die into Station 4. Screw it down until it is flush with the bottom of the Toolhead as a
starting point.
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Place a cartridge with a properly seated bullet into Station 4.
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Lower the Handle and continue to screw the Die Down until it touches the cartridge.
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Raise the Handle slightly, screw the Die down 1/8 of a turn or less and lower the Handle.
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Raise the Handle and inspect the cartridge. If the belling of the case mouth is still present, or more crimp is
needed, give the Die a 1/8 turn down or less and try again. Continue making small adjustments until the
desired amount of crimp is achieved—again, the crimp should reduce the case mouth diameter to no more than
.001-.002”.
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Once the adjustment is complete, place the case back into Station 4 and lower the Handle. Tighten the Crimp
Die lock ring using a 1" Dillon Bench Wrench and a 7/8" end wrench to hold the Die body with a cartridge in
the Die with Handle down.
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Once all the reloading stations are in use, recheck all the process parameters from each station to verify
nothing has changed due to the “full operating load” on every station.
Taper Crimp of
Rifle Cartridge
with Cannelure
Crimp–reduce
diameter no
more than
.001-.002”
Excessive crimp may show
up as a “bright ring” at the
top edge of the case neck