Correct diameter expander for 45 acp lead

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Correct diameter expander for 45 acp lead

Post by wizzer on 12/26/2017, 8:47 am

First topic message reminder :

I will be purchasing several custom expanders.  Assuming .452" lead bullets and new brass, should we be using a .450 or .451 diameter expander?  Maybe .452 on work hardened brass?

Edit--not talking flaring of case mouth, EXPANDER for inside case diameter.


Last edited by wizzer on 12/26/2017, 9:41 am; edited 2 times in total

wizzer

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Re: Correct diameter expander for 45 acp lead

Post by Sc0 on 1/13/2018, 10:16 am

Has anyone Mic'd the Uniquetek expander?

If not maybe i can sweet talk someone with a lathe to make these for the Dillon
Dillon .38 (.360 x.420 length)
Dillon .45 (.4565 x .430 length)

Sc0

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Re: Correct diameter expander for 45 acp lead

Post by bmize1 on 1/13/2018, 12:19 pm

I just bought Lyman M expanders for 9mm and 45.
45 measures .449 and steps up to .452
9 measure 352 and steps up to 358
They have turn lines from cutter and are not slick or polished at all.

Think I'll take Dillon expanders to machine shop and re-profile them

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Re: Correct diameter expander for 45 acp lead

Post by Wobbley on 1/13/2018, 1:43 pm

Super smooth finish may or may not prove to be beneficial. If the finish is too smooth it might actually grip the brass that much harder.

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Re: Correct diameter expander for 45 acp lead

Post by bmize1 on 1/13/2018, 4:48 pm

The Dillon is mirror polished and sticks if you don’t have it lubed or have carbon from firing still in there.
I bet this would stick worse as rough as it is, just my thinking anyway

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Re: Correct diameter expander for 45 acp lead

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