All of these were taken around Corpus christi give or take 30 minute drive. Normally the best shooting is around mid-late september, after that they just don't flush as often. I've hunted them without a dog which having one I'm sure would help. Find some of the salt marshes around here like around Bayside, on the island, pretty much anywhere there are good amounts of vegetation within 20-30 yards of the water. Hunt in the stuff that is anywhere from knee high to waist deep. Some will flush, most will not as they prefer to just run away and in thicker vegetation that is an easier option.
In the salt you will find mostly clapper with occasional king, brackish water will hold all four and fresh water sora/virginia/king. I've spent way too many 90-100 degree days in september chasing them to get all the species, after the virginia I may hang up the rail hunting hat
Dad with nice sora and clapper
Pile o' Sora from a great rail day