I don't know about the mountain west, but it seems to have already been eluded to and I've noticed it here in MN. If you see packs that large, you're in a game rich area, once they reduce the prey population to where it doesn't sustain that large of a pack, they disperse into smaller groups, or move on to better areas. We had packs of 6-7 with multiple packs within 10 miles of each other a few years ago, we had a great deer herd at that point. As time went on our Deer numbers keep going down, it was groups of 2-3, to this year its lone wolves and our hunting is at a low point. Guys 100 miles away are seeing these bigger groups in units where you can harvest/get tags for 2-3 deer. Our doe tag draw went from 2000 to 1000 last year. This is all anecdotal, but if I was seeing that many and could legally harvest some of them, I would do so without hesitation. Trapping would be a far more effective way to put together numbers, but if you think you can get them with a rifle, have at it.