Not sure what gun you have but I shoot the Knight TK2000 and I specifically asked Knight the same question as I saw a website that claimed you could shoot a 69 cal roundball out of their gun if you remove the choke. Knight's response was no way!! They eventually shut down that website and the false claims it made. You see the TK 2000 has an internal "jug-choke". This is an area inside the gun that the bore actually is wider than the rest and constricts before reaching the choke area. The idea is when you shoot a loaded shot cup with pellets, they expand in this area and are forced together before entry into the choke tube and result in long range bird hunting. Knight said there is a chance that a roundball could get stuck in that area. I can tell you if you want to hunt birds this is the greatest gun by far. I have a 62 yard kill with this one. So I would not load it up with roundball, sabots etc, it sounds like it is a bird gun if there is a choke.