The best replacement for steel shot is lead shot.

The best alternatives to steel shot are rated as following:
★★★★★  lead shot
★★  hevi shot
★★  lead
★  bismuth
★  steel grit

Your alternative for steel shot is not listed? Suggest!
Speaking about steel shot, one probably shouldn't forget about full choke.

Other search terms related to steel shot and their ratings are:
★★★★★ full choke
★★★★ modified choke
★★★ choke tubes
★★★ choke
★ chokes
★ turkey choke
★ no choke
★ fixed full choke
★ model 12
choke tube
polychoke
You have in mind a companion for steel shot and it is not yet here? Propose!



Google Trends

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steel shot
lead shot
hevi shot