  We have calculated the Gamow-Teller matrix elements of 64 decays of nuclei 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 demands the
introduction of an average quenching factor, q=0.744 +/- 0.015, slightly
smaller but statistically compatible with the $sd$-shell value, thus indicating
that the present number is close to the limit for large A.
