...........put some 3" #1 shot thru it and I'm here to tell ya that combination ain't for the timid or faint of heart!! I also found the pattern at 10 ft. is about 12 inches across!! I thought it was going to be much smaller. So, it appears I'll be planning on using more than one round if TSHTF at my place. I tried fireing one round with the gun held waist high on my right side. When it discharged the gun jumped back sharply and the trigger guard slammed into the middle finger of my right hand, it got my attention pretty quick! The Rem. 870 is for serious SD work, don't take it lightly.