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I use the undertaker also but didn't really see much difference between that and my stock full choke out of my benelli.
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I too never saw much difference in the tubes in my old gun, so when I bought my Remington SP-10 6 years ago or so I just had them throw in the Extra Full remington choke tube. Never had a problem with it, killed one bird at 61yds and my brother shot one with the same setup at 73yds 2 years back (He didn't realize the bird was that far until after it was dead due to the fact we were on an open ridge and the bird was walking away). Anyhow, I have heard good things about the undertaker from those who use it.