I have never used slugs in a shotgun so need advice. I have a smoothbore 12 gauge Benelli. Any recommendations on slugs? I have seen posts about guys using rifled choke tubes. Are they effective? Any guidance will be appreciated.

Friend of mine uses these Hornady's. He loves them but I haved no idea about using them in a smooth barrel.
http://www.hornady.com/shop/?page=shop/browse&category_id=d27c0a040bea71ad74e3d35d6bc0ec9e

Smoothbore shotgun uses Foster slugs.

Rifled barrels use Saboted slug/bullets.

http://en.wikipedia.org/wiki/Foster_slug

http://www.chuckhawks.com/shotgun_slugs.htm

get some foster type federal truball, they should print ok

I just bought a couple of rifled barrels and I can't find sabot slugs anywhere local.
A friend of mine gave me 3 boxes of sabots that he bought from a gun show and he said that's the best place to buy them.
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I know nothing about slugs so I have no idea why I need them around here!!
But the guns came with the extra barrels.

Cabelas has a pretty good selection. I hunt with them quite a bit up in Iowa each year. I had been using the Winchester Supreme Silver Sabot's, but after spending $4.00 per shot i switched to the Hornady SST's last year. They shoot better groups but did not expand as well on BIG deer, so they are now AWSOME hog slugs and I switched back to the Winchester for deer.