When I was much younger, it was not at all unusual to encounter a rattler when out in the sage/grass/pine country. It was not hard to pop them in the head with a .22LR 40 gr solid at 10 feet or so. I collected the rattles in a match box. I never saw a need, nor could I afford, for the expensive snake shot stuff.
I no longer shoot snakes as I find it easier to just walk around and away from them, than to kill them and dink around burying the head and all.