Until fairly recently, there were even fewer units open for muzzleloader deer. They just added many units a couple years ago. It doesn't seem that odd to me that a few units didn't get included, but I don't know why Entiat is one of them. I imagine it is just because with it being a very popular unit, they didn't want to upset too many people who plan on hunting it during the rifle season, by letting muzzleloader hunters in there first. That's just a guess, really I have no idea. Swakane is a popular unit too and it's open for muzzleloader, so who knows. Truth is, if it were open, the hunting wouldn't be that good anyway, and not many deer would be killed, with the early muzzleloader season being the last week of September, and the Entiat really only being good when deer migrate down from the high country.