I worry most about renters at indoor ranges. i would think such things would be extremely rare among enthusiasts.
i had a box of .40 lifted once and have a friend who had a couple of mags stolen somewhere else, out of state actually. I try to get a lane and table way down away from the rental crowd. Hey, I'm in Watsonville, where the smart thing to do is to leave nothing of value in your car and don't lock it. 55k people and 1000 gangbangers and associates.
I purposely don't have nice stereos. they'll cause more damage getting one out than one is worth.