There are those who believe that there is only one correct load and that is the one which achieves "critical dampening." From my own experience, the correct load is very much system dependent. Phono stages, in particular, seem to be quite dramatically different in the way they interact with particular cartridges. I agree with Doug that the only way to tell is to try different loading.
At a minimum, try something near 200 ohms, and almost unloaded (47 kilo ohms). Most of the big changes in sound will be down near the 200 ohm range. For example, the difference between 200 ohm and 300 ohms will probably be bigger than the difference between 1 kilo ohm and 47 kilo ohms). Keep that in mind if you are trying to minimize the number of trials.
As a pure guess, a manufacturer's recommendation for a loading of 200 ohm and higher means that the manufacturer thinks the cartridge works pretty well with very little loading. I would not be surprised if 47k works well in setups where there is no tendency toward excessive brightness or upper frequency distortion.
At a minimum, try something near 200 ohms, and almost unloaded (47 kilo ohms). Most of the big changes in sound will be down near the 200 ohm range. For example, the difference between 200 ohm and 300 ohms will probably be bigger than the difference between 1 kilo ohm and 47 kilo ohms). Keep that in mind if you are trying to minimize the number of trials.
As a pure guess, a manufacturer's recommendation for a loading of 200 ohm and higher means that the manufacturer thinks the cartridge works pretty well with very little loading. I would not be surprised if 47k works well in setups where there is no tendency toward excessive brightness or upper frequency distortion.