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Bullet diameter reducing dies

This page is provided purely for the purpose of creating awareness towards the subject of (or at the very least the idea of) bullet reducing dies. 

Bullet reducing dies can work out to be a very simple means of obtaining an otherwise hard to find bullet, without having to go through the entire process of bullet swaging (making a bullet from scratch). As an example, reducing dies can be extremely useful for the likes of necking down .323" projectiles to suit older .318" bores. They can also be plain fun to experiment with. But do keep in mind that bullet reducing has its limitations. Corbin, the primary manufacturer of bullet reducing dies suggest .006" as the maximum draw down and .007" should be considered the extreme limit which may result in possible failures (core may slip from jacket during drawing or when shooting). The jacket thickness and heel design can also effect how far we can take this. Corbin offer a service in which the customer can send sample bullets for preliminary experimentation. Beyond these basic tests, it is up to the customer to maintain realistic expectations as to what can be achieved with reducing dies.

In the past, I have monitored peers (using custom dies) as they drew down lightweight .375" bullets down to .366" for the 9.3 bore (down .009"). The purpose was to make the cartridge more effective on lean deer species, an especially good boost for the otherwise mild 9.3x57. Having said this, it requires huge levels of force to draw a .375" bullet down to .366" (bottle jack press) and it can be better to try this in two increments (and still be prepared for failure). Drawing from .284" down to .277" can also result in failure (again working with peers using custom experimental dies).

To find out more about bullet reducing dies (and hopefully achieve better results than we have with our experimental dies), please visit the Corbin website. Be sure to read the information carefully.

Please click here to be redirected to the Corbin Bullet reducing Die -R page.

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ABOUT US

We are a small, family run business, based out of Taranaki, New Zealand, who specialize in cartridge research and testing, and rifle accurizing.

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