Which choke is best for slugs?

Shooting Foster style slugs (American Rifled Slugs) through different chokes out of my Beretta Xtrema II to see the difference in group sizes.
My friend over at The Magnum Channel did a very similar video as a follow up to this one. He used the same slugs at the same distance but shot his groups from a Mossberg 500 using only the bead sight. Here is a link to his video, check it out-- • Best choke for shotgun...
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