You can, however, have a semi-QH with a 6" gullet,
or a full with a 6 1/2" gullet. It really varies by
manufacturer. While the gullet naturally increases in size with the
spread of the bars, you cannot judge on gullet width alone. Too bad there
is not an industry standard!!
The best thing to do is look at both the bar angle
visually, and match that, along WITH the gullet width to your
horse.
Heres some general guidelines on sizes. These are only general, as
tremendous variation occurs in what 1 saddle maker calls semi-QH-bars vs
Full-QH-bars etc. There is no standardization in the industry. Also, its hard
to really measure this once the saddle is built, so one has to
ask.
