what about hevi 13 straight 7's i just found where i can get all i want for $18 a box
You'll get varying responses here because the Fed Heavyweights have a density of around 15 g/cc opposed to the Hevi's being around 12.5-13g/cc.... but for a 12ga 3.5in, out of my old MB 835, I love the Hevi-13 #7s... no experience with a 20ga but it should kill anything you point it at within 40yds.