Best load ever 835 mossberg 3 1/2 #4 federal lead. Until last year. Same gun only this time the federal hevi weight load. this is not lead shot but the high density bismuth type shot. Used both #6 and #4. Shots were from 15 to 48 yards. 5 birds dropped dead and shook. No flopping or wing flapping just fell over and shook. Unbelievable killing power on the hevi shot type of loads. Not partial to federal it just patterns better in my gun. Definately spring for the extra bucks and get the hevi shot loads. Also I do not shoot the xtra full choke I only shoot the full. Check your patterns. the xtra full will concentrate pellets and have holes in the pattern. the full is just more even in the same size circle. The hevi shot also patterns so well any way and stays so tight that I think it is almost over choked. At 20 yards who wants to shoot a small circle of shot? Asking for miss this close. Pattern your gun at 20 40 and 50 with the xtra full and the regular full on paper or cardboard look at your results it might amaze you.