Well first thing is to check the range there on the base at Pendleton - there is one (I mean a range for individual use, not one of the several training ranges), though I don't recall the details of the facility. PhotonSD and Fractal have made good suggestions above - I may add to theirs.
Not sure what you are looking for, exactly, but assume you are looking to do more than punch paper in a static target lane.
Iron Sights is good, but indoor (they do have a friendly steels shoot each Thursday evening - check their website calendar at iron-sights.com).
Check out Raahaugue's (raahauges.com) in Corona - they have quite a few activities there, including what I think you would consider tactical pistol. Several bermed shooting bays. There's a great, informal steels shoot there several Sundays a month (see
http://sites.google.com/site/ssaresults/home) called "Steel Madness", put on by the Shooting Sports Alliance. I go to these whenever I can - they are challenging and fun.
South Bay Rod and Gun has a nice outdoor handgun range, and they do some competitions, though I think only of the static/bullseye variety. Dulzura is also a haul for you from Pendleton - probably 90 minutes each way depending on I-5 traffic. They have a nice 300-yd rifle range as well.
I'd steer you to Raahauge's - lots of action shooting activities there, and not that far (just go east on the 76 to I-15 and up to Corona).