I like the sound of this!
After writing down 160 plus shots yesterday and then manually typing them into excel.

I think a case is a good idea as would the display/buzzer/light. Could you turn the buzzer/light option on/off via the USB or push button presses?

Could the display show enhanced information? Such as Shots taken, results, average, min, max, mean.

Could you enable the addition of extra info such as pellet type, Gun name, fill pressure etc. Either loaded via the USB from the PC and selected via simple button presses or via a more complex system on the display itself. Just pushing this to something that could be used to log several guns without the need for a pc in between. Possibly too complex but there's no harm in asking.

Datalogger option is a very good idea. PC's are rubbish in sunlight!

I am sure I'll think of something else!

Mark