Hi 22,
I am in South Africa, and the Sako Superhammerhead 180gr worked very well the past season . The tight 1:10 barrel twist stabilize the heavy Bullet just fine. I got 1.2" 3 shot groupings at 109yards, with the factory hogue stock without any bedding jobs done. My rifle is currently being fitted with a Boyds stock and being pillar and glass bedded, and I am sure I will get sub MOA with these rounds.
I successfully hunted 3 impala, 3 kudu, a gemsbuck, a waterbuck and a jackal this year with these rounds, and I would recommend it to any ATR 308 owner. The gemsbuck was shot at 300 yards.
If you can get your hands on some, go and try them out on the range.
Hope this helped a bit.
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