I'm gettin my soapbox and hoppin on...not to blast you, but to support you...
the latest greatest tactikool trend that pushes for short barreled blasters with long mag tubes and tons of weighty add-ons (lights, lasers, ammo carriers, folding stocks, crazy sighting systems, et al) puts a major crimp in my hide; for generations, ya grabbed whatever was at hand whether it be a legally cut down double barrel or 30" barreled goose gun...if it handled buckshot it worked like a charm; not anymore...God forbid someone try to use anything but a dedicated purpose shotgun (defense, riot, tactical, etc);
back to your question...feel free and feel welcome to put any choke from full cylinder to modified and you should have great success with defending with buckshot; pattern size will depend upon type of choke used and brand of ammo
if I needed to use a shottie for defense, it would be my 24" barreled Browning BPS which has a modified choke installed the majority of time; it may not look as 'scary' as the tactikools, but it'll still put the payload out the business end of the barrel
