I never saw the need for "Snake Shot" in a handgun. It is easy enough to shoot a snake's head off at 6 feet with a solid bullet, if your intent is to kill a snake. If you don't have that confidence, and it is really important to kill the snake, just grab the 12 ga. In most cases, for self preservation, it is enough to just back away. Yes, occasionally someone will surprise a snake at close range and get bitten, but it is rare. If that were to happen, I doubt we would have much chance to draw and shoot it anyway in time to prevent getting hit. Around here the only dangerous snake is a rattler. Every time I have seen one, they are more intent on beating a retreat than fighting. Only if an attempt is made to get in its way or harass it, has it coiled up ready to strike.
At one time I worked at a fish farm. The garter snakes would eat our little fish. Yes, I carried a Ruger Single Six, and Yes, I killed many a snake, usually as they swam away from me on the water. Hence, I can say with confidence it is easy enough to kill a snake with a solid bullet. A rattler coiled up is a much easier target. They have a bigger head.
The real important factor in preventing snakebite is awareness. If in snake country be aware of your surroundings and where you put your feet. I guess that is good advice anywhere we go in today's crazy world? Maybe you are wanting the snake load for snakes with legs?