I've only been using a shot timer for a few weeks now and am wondering if anyone else has had the problem I'm having. While listening and waiting for the timer beep to go off, I've noticed that I sometimes jump or flinch involuntarily when a loud gun goes off, like some part of my shoulder and arm gets triggered to draw the gun whether my brain says go or not. Fairly distracting behavior, and potentially embarrassing if I cared what others were thinking about me, which I usually do not. I'm not responsible for someone else thinking I'm having some kind of fit.
While not using the timer, a .50 cal wouldn't make me jump because I've blocked audio input out of my mind to minimize distraction from all the range noise. But when I'm focusing intently, listening for the beep, audio-in seems to become trigger sensitive. I'm wearing 30 DB ear plugs and electronic ear muffs. I have the beep delay set to randomize between 2 and 4 seconds. I suspect this problem will go away eventually as I become accustomed to the new way of being queued up, since I don't recall the flinching problem on the last couple of range visits, but then I've also been lucky to not be next to any cannons.