I’ve found that there are really at least two sizes of Extreme extrusions; H4895/Varget being noticeably smaller than H4350/H4831SC, for example. In tiny 22 powder die funnels, I can get the smaller H4895 and Varget kernels to drop without bridging but larger extrusions like H4350/H4381SC will bridge terribly. I don’t know any of the Hodgdon Extreme or IMR Enduron or Alliant temperature insensitive powders that are ball; as far as I can tell, they are all extrusions of different sizes.
Earlier this week, I mounted a Hornady measure on the 550. As a general observation, I think that it’s a much better piece of kit then the Dillon measure. Sadly, it’s still struggles with IMR 4166 into little 22 caliber funnels; better than the Dillon, but not 100%.