We have calculated the Gamow-Teller matrix elements of 64 decays of nu
clei in the mass range A=41-50. In all the cases the valence space of
the full pf shell is used. Agreement with the experimental results dem
ands the introduction of an average quenching factor q=0.744+/-0.015 s
lightly smaller but statistically compatible with the sd-shell value,
thus indicating that the present number is close to the limit for larg
e A.