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Hammers are my favorite hunting bullet, but had an anomaly with one rifle:
I had tried several of the .375's and had outstanding results until at some point they just fell off. Up to 1000 they shot great! Now 1200 meters would be plenty for some folks but not in this rifle. They would have stayed supersonic well past a mile and had a SG of well over 2. Something just happened at that range and the groups went to something you couldn't call groups. Not environmentally related, not when I can grab my .300 WinMag right after and make a first round impact followed by several more to make sure.