For people in Western WA there is a silencer shoot open to the public on July 20, 2013 at the Kitsap Rifle and Revolver Club in Bremerton WA. It is $5 and there will be suppressed firearms available for the public to shoot free of charge. Silencer owners attend free if they bring a suppressed firearm.
Check out http://www.gunsafety.org
. Click on the address in the upper right corner of the page for a map to the range.