The best replacement for steady aim is sleight of hand.

The best alternatives to steady aim are rated as following:
★★★★★  sleight of hand
★★★★  sharpshooter
★★★★  archery
★★  stalker
★★  dead silence
★  grip
★  marksman
★  sleight hand
★  warlord
★  sleight of hand black ops

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Speaking about steady aim, one probably shouldn't forget about akimbo.

Other search terms related to steady aim and their ratings are:
★★★★★ akimbo
★ shotgun mw3
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Google Trends

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steady aim
sleight of hand
sharpshooter