We shoot PMC 3" mag BBB. We buy several cases so we get a great deal on them at a local gun shop. They pattern good for us and we are very happy with their performance. But like everyone else has said you have to match your ammo to your gun. I don't shoot alot of 3 1/2", I haven't personnelly seen that much difference in the them, but I buy a few boxes every year, and I always get the winchester drylok, but I don't know why.