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We do have some evidence of Leopard skull lengths being correlated with Leopard size. As in, the longer the skull the heavier the weight.
Here are a bunch of skull length measurements.
*This image is copyright of its original author
Here are body weight averages.
*This image is copyright of its original author
"Our skull data indicated that it is very rare to see female Leopards exceeding 210 mm in greatest skull length which is associated with 190-200 cm in condylobasal skull length, as used by Christiansen and Harris (2012), together with larger and thicker teeth and a well-developed sagittal crest, which is almost absent on most female skulls (only 1 among 14 female skulls in our sample had a well-developed crest).
There was some overlap on the scatterplot between adult female specimens and several smaller males"
Farhadinia et. al. 2014. Patterns of sexual dimorphism in the Persian Leopard (Panthera pardus saxicolor) and implications for sex differentiation
9 males had a skull length of 250 mm or more and 9 males weighed 75-115kg.
A Kenyan leopard shot with a 260 mm long skull, and weighed 78 kg:
*This image is copyright of its original author
So a good Leopard skull length will indicate a fairly large Leopards.
Considering the Congo Basin had many decent length (and width) skulls, there may be an indication that there were likely many 70-80 kg as well as some 80+ kg Leopards. Possibly even a few 90 or 90+ kg specimens still lurking.
Seems if if the Leopard has a skull that surpasses 250 mm length, it should be way above 70 kg.