Foster slugs are soft enough to be fired through nearly any choke but full may not give very good accuracy. Unless you have a rifled barrel do not bother trying sabot slugs, you will be very disappointed in the accuracy.
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball
your best bet for chokes is just go out and buy something like a cylinder choke or skeet choke. Choke tubes aren't too expensive. And rifled barrels for a stoeger are not cheap my was about 350 which is what i payed for the gun so unless you want 100-150 yards accuracy dont bother.
"No man ever won a war by dying for his country, He won by making the other poor bastard die for his" - General George S. Patton