how should I measure my groups??
Over the last 8 years, I have shot almost all of the premium loads for the 357 sig out of my P229. I have kept all the targets, and would now like to get the ruler out and measure my group sizes to compare accuracy. I shot 3 strings of 6 shots offhand at each target from a distance of 25yards... so 18 shots total per target.
(other than that, this is totally unscientific - Some days were hot, some were cold - some days I was tired, some days well rested)
My question is.... how many shots should I eliminate as "flyers" to more accurately represent the group sizes.....