Each gun is an entity of it's own, and this especially applies to slugs in shotguns! I've seen 2 fairly identical guns deliver some very different results with the same ammo. As a general rule, if you are using a modern firearm in good condition, you can fire a slug out of a choked barrel, Depending on sabot or full bore size, a sabot will squeeze down and pass through a choke with out much distress, a full bore diameter soft lead slug will usually do the same, as long as it's not a super hard alloy / lead mix. When this happens, You may notice stickier extraction in a few cases, indicating a bit of a pressure increase. Avoid that brand and move on to another.
As for accuracy, try a few types / brands and see what your gun prefferes. I have found that it's usully a love it or hate it affair. I live in a slug zone, and have played with many different combo's over the years. One of my el cheapo custom ideas, a single shot Cooey 840, 20" barrel with a 4" rifled choke tude added, and a scout scope, would shoot 2 " groups with one brand of slugs all day, but would print a 18" pattern with another, all of them sideways! Play with it and see what it likes.
My longest slug shot (successful) on a deer was 132 paces. A solid lead Challenger base attached type slug hit the buck facing me, 3" off center line, drilled straight through ribs, comming to rest undet the hide on the left rear quarter. The hit flipped him over onto his back, one of the most spectacular kills I've ever seen! I would not hesitate to use a modern slug up to the 150 yard range, after that you start to get into howitzer trajectories.