@pilot2001, Fed-210M are real, they're not made up... but they can be a bit hard to find, as you've found out.
They are basically the same as the regular (non-"Match") Fed-210. The difference is that a certain step of the manufacturing is done by hand rather than by machine, the idea being that this can be a bit more consistent. It's also a bit more expensive, which is why it isn't done for the non-"Match" primers.
Regular primers can shoot very well (as you know). The only reason to use Match primers is that they _might_ be a bit more consistent; you're less likely to get large variations in Match primers than regular primers.