Hunted the Steins unit 2 or 3 years ago for lope with my father. Took him 15 points to draw.
I don't think you will have any problems finding them. We seen plenty and dad got plenty of shots but couldn't connect for some reason.
Some tips......
it will be hot (that's a given) but we saw animals out all day everyday. We saw them everywhere, not necessarily by water, just out grazing in the sage brush at all hours of the day.
the roads are rough
practice shooting at longer range, seemed like 400-600 was pretty typical
sight your gun in and check your zero again when you arrive. I live in Hood River not far from you and nearly same elevation, Steins hunting was in the 7,000 elevation range and for some unknown reason when we finally checked the zero on the gun it was almost 2moa low. Not do to the 7,000 elv. or heat but must of bumped something getting there or running those bumpy roads. This certainly accounted for a couple misses. I still think about those missed shots!!
bring binos and/or spotting scope, it became very easy to spot them at over a mile
there are lots of coyotes!
With as many lope as we seen we could be selective in waiting for a good sized one. I suspect you could have an opportunity for a shot nearly every day so don't feel like you got to shoot a small one or the first one you see. Lots of coyotes too! If you have any experience hunting these critters bring your calls and pick off a few of them while your there.
Should be a great experience for you. As I recall it was over an 80% success rate for antelope and I believe the 20% that didn't get one......well, couldn't make the trip or couldn't hit anything like my poor dad that year
even though he was in the 20% it was a great hunt.
Good shooting and swage on!
BT