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Shot package is pretty crucial, then the last perk is optional/subjective to your play style. A really good setup I reckon would be shot package, quick draw in the middle tree and then knee pads for the last perk. Shot package already almost guarantees 1 shot kill and knee pads makes rushing much easier. Some other good perks for the last slot would be luck in the chamber and final round. Also shot package > range finder
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A wild bump has appeared
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Range finder, shot package, luck in the chamber, final round, reinforced barrel, aggressive ballistics, small bore, essentially anything that improves your range