I hear you on deer damage
and well, you would be surprised on how many a single deer can eat, have to remember there is 90 days till archery, and how many plants each deer can eat a day, then times by how many deer, and they eat a lot! and it adds up!!
good thing is most beans will keep growing even if browsed, but many don't make beans caus eof it being eatin too many times to mature to be able to make a pod/seeds
but least for now we are having good weather for them to grow!!
right now in my beans/ corn,
the deer are prefering the corn and pretty much leaving the beans be , but I know thats not for long!
Good luck