I haven't hunted with Power Max, but I did run a few boxes of it (308win) through my AR-10 a while back at a 200yd range.
It was an accurate round for me. My groups always tighten up with 168gr, but I found the results of the affordable 150gr Wally-World Power Max to be very adequate. Nothing else I shot above or below 168gr could touch it. My rifle is a 1/10 twist.
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