- Collet neck sizing die only
- For .300 AAC Blackout
- Sizes the neck only, no lubricant needed
- For brass fired in your own rifle
- Undersize decap mandrels sold separately
The Lee Collet Neck Sizing Die for the .300 AAC Blackout uses a steel collet to squeeze the fired case neck onto a precision mandrel, giving a precisely aligned neck and reducing run-out. It sizes only the neck, needs no case lubricant, and is recommended for brass fired through your own rifle. It is sold as a die only, and undersize decap mandrels can be bought separately.
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