I use the gobble stopper in my 870 with 3" #6's Win. I used the turkey targets last year and with a regular full choke factory I got average 22 pellets in the kill zone @ 30yds. With the extra full gobble stopper I got an average of 44 pellets! Big difference. I'm not a big fan of getting them as tight as you can, but this is a plus when the tom hangs up at 40 yards.