Lee Collet Die 303 British 90717

£25.00

The 303 British Cartridge was never designed to be reloaded.  During both wars, chamber dimensions were increased to provide increased reliability.  This poses problems those who are using modern tools made to SAAMI specifications.  When possible, this round should be neck sized and not full length sized to prevent premature stress to your brass.

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SKU: Lee90717 Category:

The 303 British Cartridge was never designed to be reloaded.  During both wars, chamber dimensions were increased to provide increased reliability.  This poses problems those who are using modern tools made to SAAMI specifications.  When possible, this round should be neck sized and not full length sized to prevent premature stress to your brass.

The Lee Collet die works by squeezing the case neck around a mandrill as pressure is applied in a loading press.  This process does not require any lubrication, only a clean case.  The collet die also removes the old primer while sizing the case neck.

In reality, loading using this method is very fast and the primary benefit is reduced run-out in the case neck.  It is possible to create very accurate ammunition using inexpensive Lee Collet dies.  For those of you that neck size as part of your loading process, you should test this die. The mandrill ‘floats’ slightly in the die so every component involved in the neck sizing operation tends to self centre around the other components which creates amazingly straight case mouths.

If you wish to increase neck tension you can ‘polish’ a small amount of metal off the mandrill using a drill or lathe and fine emery cloth.

Recommended for use in strong single stage loading presses.

There is an interesting video that demonstrates the use of the Lee Collet Die and a comparison with another neck sizing die that is worth watching.

This die is for the 303 British Cartridge

 

Weight .5 kg
Dimensions 8 × 6 × 2 cm
Brand

Lee

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