Good gravy that things enormous. I wonder how much venom those fangs could pump into a victim. I’m assuming it would be exponentially more dangerous than your normal 3-5 footer.
The older the rattler is.. the wiser it is. Youth rattlers inject all of their poison because they don’t know how to limit it “per target”. The older ones limit what they inject by what they ‘think’ is what is needed to neutralize their target... but I sure as heck wouldn’t want to be on the receiving end of it’s fangs...
The largest I ever killed (strange hobby when I was a teenager back in Texas) was about 5’11”... 17 rattles.