John, this info comes out of the revised Smithers, basically the "Bible" on Southern African mammals:

a) Matetsi Zimbabwe
Females 28.2-34.9 (n=7), average 31.5kg

b) Waterberg, Limpopo province, RSA
Females average 34.9kg (n=6)

c)Northern- Eastern adn Western Cape, RSA
Females average 21.2kg (n=9)

d) Kruger Park, RSA
Old adults
Females average 37.2kg (n=6)

Prime adults
Females average 37.5kg (n=6)

Then in a seperate study, for Northern Namibia they found:
mean weight between 18 leopards:
females 25kg.

In other words, a leopard female can weigh from 25 kg to 55kg (the heaviest I have personally hunted with a client)...