Re: 4831/4831Sc Hodgon
For a long time, 4831 (the IMR variant) was *the* big magnum powder.
Bear in mind that IMR4831 and H4831 are not identical (though their intended cartridge applications are) and load data is not interchangeable.
H4831 and H4831sc are nearly interchangeable and share load data, HOWEVER, if you worked up a stiff load of one, you should not switch to the other without backing down 5% or so and working back up.