You live and you learn (and learn and learn), or...
"How To Burn Up Scoopshovelfuls Of Powder Uselessly"
Went out last night to ensure my .358 STA was sighted and ready to slay pigs this weekend. I specifically wanted to compare two different loads so I had only 9 of each---3, 3-shot groups. Should be great plenty, right?
First 3 shots were not on the paper at 50 yards (indoor range--unfortunately, all I got). "Huh...", says I. Pull it back to 25 yards and find out I am 6" low and 3" left. Adjust back to center at 25 with the next two shots and it's back out to 50. Three shots later and I have two touching and a third 'high and outside'. Figuring that I might have pulled one, I am now oficially out of the one load.
Switching to the heavier load, another 3-shot group gives the same performance; two touching and a third considerably outside. At this point, I am disappointed as all three shots 'felt' right. Being stubborn, I racked up another 3 shots and these three were all widely separated. At this point, I am thoroughly frustrated and I put the rifle down for a while.
It finally occurs to me to check the tightness of my scope mounts only to find that the windage screws on the rear mount are loosey-goosey. "Sigh...." I did fire the final three shots "sighting it in" with the final round being where I want it but I have no real confidence. I can load more but do not know if I will have adequate time to get back to the range.
I hate re-re-relearning old lessons....