The 12 GA 5 is the old numbering system MEC used to use. If you can find the old chart it will tell you what a 5 drops. Going after doves now but when I get back I will go to the garage and look up a 5 to see what it is supposed to drop.
But best bet is to put your powder and shot in it and see what it actually drops and go from there because they are always low on what they drop compared to the chart.
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