A buddy of mine was successful down there for the archery pronghorn. The tactics are pretty simple, find water sources and set up a blind before someone else does. The competition is somewhat high as water sources are known to a few people. Most likely you will be trying to beat other hunters to the water sources. Your blind cannot be set up before season, so I hear guys go in at midnight of the opener to get to places first. I believe he had the 21a tag. I had it this year as well but didn't make it down. I think they are all good tags, just grab a map and get a handful of places you think a blind would be good and give it hell.