Good question, when I started shooting Cowboy Action with a Winchester M97 I bought one where the previous owner had just sawn off 10" of the barrel and installed a bead sight. With non reactive targets this was no problem. The problem came when shooting a reactive target that weighed anywhere from 35-40 pounds at 15 to 18 yds. The shot just wiggled the target a bit then it laughed at me! I had a screw in choke installed and for all SASS matches I have no problem. Unfortunately not all clubs are SASS affiliated and set their targetry at longer distances. Problem is easily solved I added a full screw in choke to my shotgun. Depending on the match targetry distance determines whether I use the cylinder choke or the full choke. Changing chokes take 30 seconds and a quarter.