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Historically, the method you have always used to do this is the minimum NAV method because you want to use the lesser of the beginning or ending NAV for the performance period:
Minimum NAV Method:
Load Dollars = ($1,000/Begin NAV) x ((Minimum (Begin NAV, End NAV)) x Load Percentage)
You have added the option to use a different method, the Beginning NAV method. This method always uses the NAV from the beginning of the period to calculate the dollar load amount:
Begin NAV Method:
Load Dollars = ($1,000/Begin NAV) x (Begin NAV x Load Percentage)
You can use the Begin NAV method to calculate a return for a mutual fund share class that is structured so that the shareholder load dollars are calculated using the beginning NAV, and you want the return to reflect that practice.