The problem is one drops the exact amount of a powder designed for 1 1/8 ounces but you are pushing only one ounce of shot, which would either require a different amount or even a completely different powder. I imagine the one ounce of shot with that powder is moving pretty fast.
I guess MEC thinks you are going to use their chart to select their recommended bushing, which will always be lighter, and are not going to weigh the powder charges and change bushings to get the exact amount.
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