Thread: IMR 4166
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Old August 27, 2015, 07:38 PM   #10
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Join Date: June 18, 2013
Posts: 258
Originally Posted by stubbicatt View Post
T O'Heir, I'm pretty sure that while bullet weights matter a great deal in terms of powder charge, so too does bearing surface. Unless I really missed the mark here, the Barnes pure copper slugs are significantly longer, with longer bearing surfaces, than traditional lead core, gilding metal jacketed, bullets.

I'm not sure, but I recollect that the Barnes bullets do require a lighter load to achieve similar pressures.

This makes more sense than all bullets give the same pressure with the same load. Could cause trouble if you don't pay attention to the details.
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