Sizing die Question

50 BMG, Collet, and steel reloading dies plus the Factory Crimp Dies. Also, discussions concerning the Deluxe, Pacesetter, and RGB die sets.

Sizing die Question

Postby sixshootertexan » 28 Oct 2020 20:52

This question is about how small should a die squeeze the case to. This is just a generic question for all calibers. Lets say we are loading a .303 British. The bullets are .312" diameter. The expander is .310". How small should the die make the brass .306"- .308" before the expander opens it back up to .310"?

I have a set of dies that is going all the way down to .298". I think it is over working the brass and in some cases crushing it some to have run out in the brass. Wall thickness varies .001".

Thanks Ricky
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Re: Sizing die Question

Postby RBHarter » 28 Oct 2020 23:09

Yep that's overworking the brass some .303-.305 would be better . If you have access you might try a 300 WSM for neck sizing . I have a 30-30 with full body dimensions and use a 308 sizer to neck size the thinner brass and larger neck dia in the die only sizes down to .306 for loading .309 paper patched and .310 cast . I think a WSM die would do the same for the 303 .

As a more permanent solution the die can be lapped larger . I've read about it but never done it as I have many alternative dies to try where needed.
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Re: Sizing die Question

Postby sixshootertexan » 29 Oct 2020 07:56

I work at a machine shop so I can get it opened up. I went ahead and got an older set of dies and they are sjzing dowm to .308".
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Re: Sizing die Question

Postby Ohio3Wheels » 29 Oct 2020 08:06

In theory the sizing die should return the case to the SAAMI specs and if properly adjusted most do the job. Then there are the out lyers. If that's a new die I think I'd have a speak with the manufacturer.

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