The absolute best way to catch snappers is to buy a pack of the long shank snapper hooks. Take the leader off the hook. Tie the main line to a small snap swivel. Now, the hook itself is what is going on the snap. Take a spearing, and insert the eye of the hook through the back of the spearing starting right behind the dorsal. Run the hook through the body so the eye now comes out the mouth and then clip the hook back on to the snap swivel. You can leave the hook as is now, or put the point back into the spearing. It really doesn't matter, but I like to put the hook back through. Using this method, the hook point is towards the back of the spearing, and snappers almost always hit from the back. This method is also deadly using killies and small peanut bunker.
Once baited up, just cast out, let it sink a few feet and look for any twitches in the line which would indicate a bite. If you do not get a bite, crank the reel a few times and let it sink. Keep repeating this. If you notice snappers following it but not hitting it, vary retrieve speed and how much you retrieve each time you reel. Also vary how much you let it sink. This method should be done with no float and no weight. If it is too windy, a float can be used but it is best without it. When you get a bite, give the snapper a couple of seconds and ust a twitch of the wrist is all that is needed to set the hook. this way of snapper fishing will out fish any other way, and it will easily out fish snapper poppers.
Hope this helps. Good luck