Reference Chart
| Make | Gauge | Cylinder | Skeet | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | Full | Extra Full |
| Berretta / Benelli Mobil | 12 | 0.726 | 0.721 | 0.716 | 0.711 | 0.706 | 0.701 | 0.696 | 0.691 | 0.686 | 0.681 |
| Berretta Optima | 12 | 0.732 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 |
| Berretta Optima Plus | 12 | 0.732 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 |
| Benelli Super Sport | 12 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 | 0.682 |
| Benelli Crio | 12 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 | 0.682 |
| Browning / Miroku Invector | 12 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 | 0.682 |
| Invector Plus | 12 | 0.74 | 0.735 | 0.730 | 0.725 | 0.720 | 0.715 | 0.710 | 0.705 | 0.700 | 0.695 |
| Winchestor Invector | 12 | 0.735 | 0.730 | 0.725 | 0.720 | 0.715 | 0.710 | 0.705 | 0.700 | 0.695 | 0.690 |
| Perazzi Series 4 ( 18.4 ) | 12 | 0.726 | 0.721 | 0.716 | 0.711 | 0.706 | 0.701 | 0.696 | 0.691 | 0.686 | 0.681 |
| Perazzi Series 5 ( 18.5 ) | 12 | 0.737 | 0.732 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 |
| Krieghoff | 12 | 0.733 | 0.728 | 0.723 | 0.718 | 0.713 | 0.708 | 0.703 | 0.698 | 0.693 | 0.688 |
| Rizzini | 12 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 | 0.682 | 0.677 |
| Lanber | 12 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 | 0.682 |
| SKB | 12 | 0.735 | 0.730 | 0.725 | 0.720 | 0.715 | 0.710 | 0.705 | 0.700 | 0.695 | 0.690 |
| Remington | 12 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 | 0.682 |
| Blaser | 12 | 0.732 | 0.727 | 0.722 | 0.717 | 0.712 | 0.707 | 0.702 | 0.697 | 0.692 | 0.687 |
| Bettinsoli | 12 | 0.729 | 0.724 | 0.719 | 0.714 | 0.709 | 0.704 | 0.699 | 0.694 | 0.689 | 0.684 |
| Fabarm / Caeser Guerini | 12 | 0.725 | 0.720 | 0.715 | 0.710 | 0.705 | 0.700 | 0.695 | 0.690 | 0.685 | 0.680 |
| Beretta / Benelli Mobil | 20 | 0.627 | 0.6235 | 0.62 | 0.6165 | 0.613 | 0.6095 | 0.606 | 0.6025 | 0.599 | 0.5955 |
| Browning / Miroku Invector | 20 | 0.618 | 0.6145 | 0.611 | 0.6075 | 0.604 | 0.6005 | 0.597 | 0.5935 | 0.59 | 0.5865 |
| Invector Plus | 20 | 0.63 | 0.6265 | 0.623 | 0.6195 | 0.616 | 0.6125 | 0.609 | 0.6055 | 0.602 | 0.5985 |