Doubt something other than a public range will be shared. These kind of spots are hard to come buy and generally see too much traffic already. This is just short of asking for a Honey Hole. 
yep..
200-500 shouldnt be too hard to find, you just gotta go burn some fuel to find it.
but i agree...no offense but im not posting my spots out here so that someone googling it can find it and then it turns into a trash pit and then gets closed down.
but to be helpful, the renton sportsmans club gun range has a 200 yard rifle range.
i hate that place and havent been in 10 years, but they have what you're asking for.