A300-600 is variable stop....high breakout....and with nearly linear variation in pedal force versus deflection.
A300-600R has a light breakout force.
APA submission to the NTSB, page 8 -
http://alliedpilots.org/Public/Topic...submission.pdf
The change in maximum force and degrees of rudder per pound between the A300B2/B4
and the A300-600 is highly significant. The A300 family (should say A300-600R. Look at chart on page 8) has the distinction of having the
lightest breakout force and the highest number of degrees of rudder travel per pound of
force of any other transport category aircraft. Once a pilot initiates rudder movement, he
or she will be challenged with the most sensitive rudder handling qualities of any
transport category airplane. This sensitivity is a precursor to a characteristic known as
Aircraft Pilot Coupling (APC), a condition typically “…not feasible for a pilot to realize
and react to in real time,” and considered unacceptable in U.S. certified designs
(National Research Council 15). Simply, a very light application of force coupled with a
very small movement of the rudder pedal will yield full deflection of the rudder.