The entirety of Blanco County as of 2021 has a population of 11,886 so I'm not sure that sample size is going to tell you anything. It can be 0 several years then then 52.something the next. But you were commenting on stray bullet incidences, not murders (which can occur by a variety of means) within a broader gun violence context.
In that context, anecdotally, in the almost exactly 20 years I've lived the Eddie Arnold version of Green Acres compared to the previous 36 of the Zsa Zsa version, as far as gun violence-
1 suicide by former co-worker
1 suicide by next door neighbor on Xmas Eve
1 murder of co-worker's son at drunken party
Boss's Silverado showing up on a Monday with a bullet hole thru the quarter panel (it lived, we laughed)
If I extended the degrees of separation, I could include more, like a fund raiser for a plant (I delivered to) employee's son killed in hunting accident.
And that's excluding numerous gun violence averted anecdotes of guns being drawn or about to be drawn.
In defense of your implied point, times have changed, but I've wracked my brain trying to think of gun violence when I've lived in the city, and the closest I can remember is old home movies of my grandfather and relatives target shooting in some park in Houston in white button ups and ties.