I'm sure you're a talented shooter, Alan. I'm also sure that the rest of the painstaking loading operations you use have at least as much to do with those single-digit SD loads as your fastidiously weighed charges.
You may be correct in part, precision reloading is about eliminating variables. Powder weight is one of those variables we can control and it does contribute to accuracy. The fact that we use digital scales successfully seems to be lost on some. Beam scales have the same issues with static charges and air currents as do electronic scales, and you shouldn't have a cell phone near a reloading bench regardless on the type of scale you're using.
The first reloading scale I bought was a 10-10... back in '82
