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Old 01-11-2017, 03:28 AM
Mikeinkaty Mikeinkaty is offline
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Default Brinell hardness for polymer coated lead

Had a guy tell me this for determining what lead hardness to shoot. Considering powder or hi-Tek coated lead bullets.

Divide the velocity by 100 and subtract 4 or 5. So, if you wanted 2000 fps then the Brinell Hardness to use would be 15 or 16.

Is this a good ballpark estimate?
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Old 01-11-2017, 04:48 AM
Wise_A Wise_A is offline
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It doesn't even look close, tbh.

People often repeat--

Optimum BHN = PSI / (1422 x .90)

--sometimes subbing in CUP for PSI, but for the most part, it also doesn't hold up real well.

The truth of the matter is that it's just not that important. Softish for low pressures, and hardish for high pressures. Beyond that, don't sweat it.

Although at 2k fps you're well into GC or jacketed territory anyway.
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Old 01-11-2017, 06:49 AM
Ivan the Butcher Ivan the Butcher is offline
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The hardness of the lead in coated bullets shouldn't matter. The coating stops the leading! The question should be; What is the recommended max velocity for the coating? I believe it is around 1900-2000.

Ivan
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Old 01-11-2017, 10:24 AM
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JBnTx JBnTx is offline
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Quote:
Originally Posted by Wise_A View Post

The truth of the matter is that it's just not that important. Softish for low pressures, and hardish for high pressures. Beyond that, don't sweat it.

^^^^^^^This
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Old 01-11-2017, 02:26 PM
Mikeinkaty Mikeinkaty is offline
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Quote:
Originally Posted by JBnTx View Post
^^^^^^^This
I like simple answers!!
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