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270-280 kg is not that far from the 290 kg estimation. Besides, as the tail is very short, probably there was more "body" than "tail" in that length, and the weight could be between 280-290 kg in the lower side.
I think that c.290 kg seems reliable for this tiger if it were un-baited, but a figure of c.300 kg is not out of the question (301 kg to be exact, using the data of Sunquist (1981)). The large tiger of Brander was estimated at about 600 lb (272 kg) in Brander words, but its weight could be obviously more.