How old is your IMR4350? Not asking to make sure it's still good, but I bought a couple pounds of IMR4350 a couple years ago, the stuff made in Canada, and it turned out to be "short-cut"! So far it has produced just about exactly the same velocities as the standard. long-granule IMR4350 that most veteran handloaders know so well.
Why would the powder manufacturers not make all stick powders short cut?
Changes burn rate, with short cut theoretically burning faster due to more surface area (assuming same diameter granules) unless the coating, or something else, is adjusted along with the powder granule length. I don't know how much effort (money) adjusting the formulation of the coating would require to compensate for surface area change, but I'm sure the powder companies evaluate the anticipated ROI before they make that leap.
