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The purpose of the different rotors is for using different powders and different volumes of powder. The rifle rotor is significantly larger and is for dispensing large volumes of powder accurately. The pistol rotor is smaller and is for dispensing small volumes of powder accurately.
Additionally, the micrometer inserts are much more accurate than the insert that comes standard with the press.
As far as W231 goes, I always used the standard rotor for that powder.
Regards,
Dave
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