What, where and why folks use snake/rat shot is/are dependent on needs and of course compliance with local rules but I suggest folks need to remember/learn where the point of impact is at very close range. Next time you are out in the field grab a piece of cardboard or paper. Draw your snake/rat on it. From a safe distance shoot the drawn target. The first time you do this you might be surprised. Remember the sight and barrel were not designed for 3 feet shots. It will also demonstrate why shot shells are sold....hard to find, expensive but useful when needed. I swap guns at the gate. Mammal gun outside the gate, reptile gun inside the gate. Easier than swapping ammo, it’s a routine along with boots and insect spray.