You were doing loading at the range so you needed SD right then and there?Yes, seriously I was doing load development for a 375 Chi tech and I need to know my standard deviation of a string of 10 or 20 rounds if I delete one or two. And how else are you gonna figure it out without doing the calculations one way or another if the device fails to account for the change after the shot is deleted?
I guess my reloading has never been so critical that I needed to do all that at the range. And at home, it’s easy peasy to me and not a “pain in the ass”
To each their own. Cheers