Originally Posted by Broz
All I can say about it is I have seen it over and over especially with big 338's. The loads shoot right at or just under 1 moa at 100. Usually 3 groups of 3 shots ea.. Then I take them to 200 or 300 yards and the same loads shoot .5 moa or better repeatedly. Now not just once in a while but quite often and I work up loads for over a dozen long range rifles a year. That is a conservative figure.
Call it what you want, but if they fight me at 100 I take them farther to confirm what I really have.
If you have a rifle/bullet combination that consistently does this then it would be great if you could set up a test and demonstrate it. Perhaps it could be done by putting up a target aimpoint at 300 or greater but not actually dialing the elevation in the scope. Then some very thin cellophane or rice paper could be set up at 100, 200, and 300 yards that would indicate the group at those ranges. It would be very interesting to prove that what many think is happening really IS happening. We will never know for sure until we actually observe this decreasing dispersion in group size of the same set of bullets.
Until that happens I'll stand on my belief that if such a test is performed, we will see that the groups never get better with range because there is no way for bullet to steer itself back into a group.
That said, I accept without question that people do see what Jeff describes above...where for some reason they are shooting better angular groups at 300 than 100. The question is why, and if we ever figure it out my bet is that it will have to do with aiming error due to parallax as was mentioned, or a human factor of some sort. I know for sure it is very common for people to shoot better groups when they can't see them for example. It's not something to dwell on because it's not a bad problem to have( unless you are a 100 yd bench rest shooter) but I would like to know the answer out of sheer curiosity.
So, if you can demonstrate this phenomenon consistently and repeatedly then someone please record it using the method I described or a better method and give us gun geeks another ballistics subject to consider when we should be working!