I think the old Hansen, PPU, PPY and Grafs are/were made in the same factory. Not sure if the case manufacturing was effected by the massive explosion in the powder plant or not. Maybe they are made in entirely separate facilities?

I have noted some vagaries in velocities between the different headstamps, indicating some variable internal dimensions, but as with the differences in jacket configurations of the 285 Prvi bullets, I suspect they are more related to lot variances than specification differences.