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I also have had nothing but fine results from Speer Hotcor's. I have used the 105 gr. 6MM, the 150 gr. 277, the 150 and 180gr. 308, and the 250 gr. 358. My favorite elk bullets were the 180 gr. out of my 30-06 and the 150 gr. out of my 270. I have never had a single instance of these bulets failing to give good penetration. This said I have made a habit of not hitting the onside shoulder just to test bullet integrity. I still consider the 150 gr. 30 caliber bullet at 2850 fps to be one of the best deer combinations known to man.