The 168's may be borderline successful. Under some conditions they will go subsonic before reaching the targets. It takes a stiff load for them to reach 1000 yds supersonic. 175 's might be a choice to look into as they were designed to maintain velocity at distance.
I have fired 168's at 1000yds and while they remained fairly accurate they did not always enter the target straight on. [AKA keyholed]
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David
NRA Benefactor Member
Distinguished Rifleman #731
Presidents 100
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