The recent ‘missed headshot’ thread got me surfing… Unfortunately I ended up with more questions than answers. I’ve never taken a head shot, which is a probably a good job.
My technique for selecting ammunition, and zeroing, has been to shoot three shot groups and select, or adjust, according to the results. Apparently I may as well have been pissing in the wind.
To get any meaningful data my group size would need to be larger (At least 5) and repeated several times (At least 5). So my ammunition has essentially been selected by chance. In terms of zeroing, because the exercise has been repeated several times, it has at least got me into the ballpark.
I often shoot impressively small, three shot groups, and when these happen to be in the bull I’m chuffed and leave the range with my ‘zeroed’ rifle. The next time I’m down at the range I sometimes find my group has shifted slightly or am baffled by a flyer.
However practically every shot lands on a small Shoot N C Target (7cm/3inch diameter) at 104m so accuracy is sufficient for heart/lung shots with a margin for error but clearly not for head shots.
None of this will come as a surprise to anyone who approaches the subject scientifically. For reasons which haven’t completely got my head around, but that are subject to general consensus, a 1” rifle will put 95% of five shot groups into between ½” and 1 ½” with no change in real performance.
So, coupled with imperfect zeroing, imperfect shooting technique and variable conditions means, that whilst it might be possible for me to regularly shoot small groups, they may not be at the point of aim.
Group Size Analysis