Although your load is not on the chart, the chart would extrapolate at about 1230 for your load. The truth is that you don't need to go to a 2 3/4 dram equivalent with 7/8 ounce loads. You are better to go back to about 2 1/4 dram equivalent to achieve a better balanced load unless you are going for the gold. If you are going for the gold, in other words box pigeons or high ducks, you would be better advised to add to your shot load rather than your powder.
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