There are several varieties of butcher/packer's knots that start with nooses based on figure eight, overhand, double overhand, granny (alias two half hitches when inverted), etc. The slick thing about the buntline is its superiority in adjusting then holding loop size. With butchers and packers, there's little intention of untying; so, no need for the slipped buntline for them.
What is great about this forum is that its contributors look for ways to transfer knots to uses other than those "intended" or combine features, like the slipped buntline, with classic versions of working knots to expand their functionality.
Another butcher/packer's knot, #192, shown by Ashley uses an inverted tautline hitch. It's even bulkier but holds loop size better than the buntline.