Thread: IMR 4166
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Old August 27, 2015, 07:05 PM   #9
stubbicatt
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Join Date: September 15, 2007
Posts: 1,707
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.
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