Dram Equivalent of Various Buckshot Loads?

[.455_Hunter]

Greetings,

I know the "dram equivalent" system is kind of archaic, but it is still useful for providing a relative level of felt recoil to the shooter, and also for selecting cheaper game loads that match the recoil of your selected "duty" load. Does anybody know the rough dram equivalent for the following loads 2 3/4" 12 gauge loads?:

1. Reduced Recoil Buckshot

2. Traditional or Standard Buckshot

3. Magnum Buckshot (2 3/4")

Thanks!

Hunter