If you try your favorite powder, and it does not work well with the 550 measure, you might try using a different style PM on your dillon press. Both Hornady and RCBS offer case activated linkages for their PMs that thread into a std die location. But they currently do not expand the casemouth in the same step (not a problem for rifle dies anyway). Hornady has announced a new case activated linkage that will also expand the casemouth.
Drum type measures (like redding, rcbs, hornady) fill/empty from the ends of the cavity, which seems to work better than the dillon measure, which fills/empties from the side, on stick type powders. However, even they do not meter stick powder as well as ball/flake powder, but they might work good enough for your powder/application.
Another option is the JDS quickmeasure, which is supposed to work well with stick powders.
Andy