What he said ^^^.
There would be a MOUNTAIN of blown up shotguns out there if you could not fire a slug thru a choke.
In GENERAL, there are two chokes that should not be shot with a slug- and best accuracy for a rifled slug GENERALLY comes from a modified.
There is a choke known as Extra Full. Used by turkey hunters. Do not use slugs. Too tight.
There were variable chokes used on a few guns in the 50's and 60's, such as the Mossberg C-Lect choke. This had individual steel "fingers" that were squeezed togther by a twist type collet (we used to call them Dial-a-Ducks) It is possible to break one of the steel fingers with a slug.
For all that are wondering- use a pocket knife, and cut open a slug. Place the removed slug in the barrel. Will ordinarily fall all the way thru the barrel. They are made slightly undersized. The soft lead in the ridges (rifling) of the slug WILL squeeze down a lot if the choke is a bit tight.