if you dont mind driveing down to castle rock/toutle area theres a place along the toutle river thats good out to 1000,its the same place they where going to put an actual shooting range,thats prolly your safest place too shoot..theres also a couple places inbetween vadar and castle rock,and then theres some state land out toutle that is "ok" but the wind is a pretty tricky there.
let me know if youd like more specific directions