Take HWY 26 West out of Beaverton/Hillsboro, then exit left onto HWY 6. Along HWY 6, when you start to enter the Tillamook State Forest (near the Brown's Camp area), take any dirt/gravel public road that is not gated. Every open pit, quarry, campsite, or pull-off you come to will be littered with shotgun shells, broken clay pigeons, brass, and even blasted-up computers, appliances, etc. It isn't pretty, but it's legal to shoot there. These spots are no more than a 45-minute drive out of downtown Beaverton. If you're willing to drive more than an hour, spots become more remote, more beautiful, and much less crowded.