One: I've never seen a test that showed under-spec penetration from low recoil shot.
Two: Most tests I've seen show increased penetration in gel with low recoil because there's less pellet deformation.
Google is your friend. Shows that while it still is devastating, it's less penetration. Considerably so.
http://www.thetruthaboutguns.com/2010/02/robert-farago/shotgun-penetration-with-various-rounds/
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