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The 350 grain bullet used in the 350 grain Buffalo Bore 45-70 load is the Speer 350 grain HotCor. It has a ballistic coefficient of .232 according to Speer.

The 405 grain bullet used in the 405 grain Buffalo Bore 45-70 load is the Remington 405 grain JSP. The ballistics calculator at realguns.com provides a .285 ballistic coefficient for that bullet. I have also seen reported a .281 ballistic coefficient for the .458" 405 grain Remington JSP.
 
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