Every source I was ever able to locate suggested 1.5 to 2.0 gm for the Grace Ruby, and both of mine, one re-tipped by SS and the other still with its original elliptical, track best at about 1.6gm. So, I cannot imagine that this model would track well at 0.5gm, no matter what one may find on VE, which can at times be a cesspool of erroneous information. Not that there's anything wrong with that. But here we are lost in our own discussion of cartridges that the OP does not own and did not ask about. Such is the way of Analog, Grasshoppers.
