The best replacement for rifled choke is rifled barrel.

The best alternatives to rifled choke are rated as following:
★★★★★  rifled barrel
★  rifled slugs

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Speaking about rifled choke, one probably shouldn't forget about rifled slugs.

Other search terms related to rifled choke and their ratings are:
★★★★★ rifled slugs
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rifled choke
rifled barrel
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