I know how big those Eastern Diamondback Rattlesnakes can get.
When I was in the USN back in the Seventies at Cecil Field in Northern Florida, they found one near the runway on the base, and they had a picture of it in the paper.
The guy was standing on the bed of a pickup truck, holding the snake by its neck straight out, and it was so big it was touching the ground and coiled up a bit where it touched it. The thick part of the body looked bigger than the fat end of a Louisville Slugger!
I had absolutely no idea those things could get that big!
He must have done something less than intelligent. Best thing is to leave rattlers alone. They have a job to do.
They get that large in extreme age over 20 years old- and usually try to stay out of harm’s way. Eat their weight in rodents/rats/mice, and even other snakes. That big indeed.