They break them off so easily the number can be kind of irrelevant. I gassed one years ago that had a full grown cotton tail in it. Way over 6 feet but only had 4 rattles.
I saw a huge rattler on the ranch at Devine last year that was the second largest I ever saw in the wild. Unfortunately, she scooted under a wall of white brush so thick that I dared not follow her in. I am guessing her well over 6 feet in length and extremely thick, I got a glimpse of her tail as she slid under the cover and the rats had consumed almost all of her rattles. Ironically, the snakes d
go into the packrat piles to catch the rats and while in the piles, the rats are consuming the rattles off the unprotected tail.
Adios,
Gary