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- Dec 1, 2015
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When I was using 150 gr. 777 loads and 400 gr Precison Rifle pure lead bullets, I had trouble with over expansion (over 1 inch) and under penetration on elk. The old bison hunter Frank Mayer used 1:16 tin:lead (BHN about 12) for bison out to 300 yards and more shooting a .45 caliber with 120 gr. black powder and 550 gr. bullet.