You can read about Alexander “Sasha” Siemel in his own book “Tigrero”, if you can find it, or in Peter Hathaway Capstick’s excellent, “Death in the Silent Places”
Capstick relates that the size of jaguars varies with their locales. A large jaguar in Mexico might weigh 200 lb while in the Mato Grosso that Siemel hunted 350 lbs and up defined the big cats.
The skin of one killed by Siemel was bigger than that of a large African male lion. Sheer size of the skin indicates a weight of well over 400 pounds.
One jaguar that almost killed Siemel measured out at nine feet and three inches and an estimated weight approaching four hundred pounds.
If you can snag either book you’re in for an exciting read.
Is that the one he killed with a spear?