Neither of them are popular powders in the 270 Wizzum. Especially varget. Don't know of anybody who runs it in the WSMs. The powders I listed all work well in them. I have not personally used R-17 in it, but it was designed for such WSM type cartridges and I know others who have used it with high velocity/accuracy. Magpro also produces very high velocities, higher than R-19 or Varget......