The great thing about the MSM to me is it super easy to work with compared to a RUM or STW.. being as it is set up for long seating it has PLENTY of space for the slow, dense powders. Even with 83 grains of 33 it was still very lightly compressed. It's not a miracle round at all but it is anything but finicky. Even good old H4831 does well, but just isn't as fast as those ultra slow powders.
My only complaint is having to do inside neck reaming to get rid of the donut after forming, but once I figured that out, it's been super easy to load for and the speeds are there.
