Correct me if I am wrong Jack but the correct way to measure a group is to first measure the hole in the paper that the bullet leaves. This hole will be from the outside edge of the black smear to the other outside edge of the black smear. You then measure the holes (fartherest away from each other) from outside of said black smear to outside of said black smear, then subtract yout first measurement.
Most bullets will not leave a hole in paper that will be the same size as the bullet diameter there fore if you subtract the actual bullet diameter you are getting a false group size.
Now I know that this is extreme but the question was how to do it correctly. While the method that Bluedeacon will get you danged close (and the one that I use also) it allows for a fudging of actual size /ubbthreads/images/graemlins/wink.gif For casual shooting it isn't going to matter but in competition it does.....James L.
just being a smart alleck Bluedeacon /ubbthreads/images/graemlins/wink.gif /ubbthreads/images/graemlins/wink.gif /ubbthreads/images/graemlins/wink.gif
