from remington.com :
"Q:Which choke tube should be used with the Sabot Slugs?
A:
The Sabot Slug was designed for the fully rifled barrel or fully rifled choke tube. The Slugger Rifled Slug should be used in a smooth bore barrel with an Improved Cylinder Choke Tube.
Our Rifled and Extended Rifled deer choke tubes can be used in vent rib barrels. You can shoot the newer sabot style slugs through these Rem chokes, however your best accuracy with the sabot style slugs will come with a fully rifled barrel.
We recommend an improved cylinder choke for shooting rifled slugs and a modified for shooting buckshot.
"
From winchester.com:
"Question: What slug design should I be using in my shotgun?
Answer: Winchester Ammunition offers two slug designs, the sabot slug or the rifled slug. Sabot slugs are designed to be used in rifled barrels or in smooth barrels with a rifled choke tube. Rifled slugs are designed to be used in smooth barrels. We have found the best accuracy when using rifled slugs in a cylinder or modified choke. We do not suggest shooting rifled slugs through a full choke.
"
In other words; either use an improved cylinder choke tube with a rifled slug, or use a sabot slug with a rifled choke tube/rifled barrel. I've found that 2 3/4" sabots work better out of the rifled tubes, dunno why.
Brenneke KO's are a hybrid that can be used in either style of barrel. If you go to brenneke's webpage, they list which slugs to use in which barrel style. The Brenneke KO was designed to be used in pretty much every safe barrel config (imp cyl, rifled barrel, rifled choke, etc).
Shooting rifled slugs in rifled barrels (and to a degree, rifled choke tubes), can cause leading, plastic buildup in your rifling, and a loss of accuracy with your slugs. Typically the choke tubes die pretty quickly from that, the rifled barrels don't get damaged unless you get a LOT of lead buildup.
Rule of thumb: if you have ANY rifling, use a sabot slug, if the barrel is smooth, use a rifled slug.
If you go to the companies websites, they list recommended yardages for their slugs to be used on game.
Hope this helps.