The best replacement for modified choke is improved cylinder.

The best alternatives to modified choke are rated as following:
★★★★★  improved cylinder
★★★  full choke
★★  improved choke
★  improved
★  improved modified
★  improved cylinder choke
★  modified choke
★  cylinder bore
★  skeet
  modified
  accu choke

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

Other search terms related to modified choke and their ratings are:
★★★★★ slugs
★★★★ buckshot
★★★ rifled slugs
★★ steel shot
★ slug
steel shot is
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modified choke
improved cylinder
full choke