Re: Can zero change 1moa going from bench to prone
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Greg Langelius *</div><div class="ubbcode-body">Going back to the initial question, something changed. Different outcomes indicate different conditons, period. What changed was the position itself.
The rifle and ammunition, shooter and environment all act together as a seamless whole. Alter one and you alter the outcome, and altered outcomes insist that one of them was indeed altered.
As the bullet transits the bore, the rifle recoils, this moves the shooter, and between them this results in a dynamic release point with the bore axis deviating its direction relative to its starting point where the POA was in alignment with the sights.
In truth, the bullet always goes where the bore is pointed, and in practice, it's seldom truly aligned the same as it was when the sights were aligned prior to the sear release. How consistent that resutant bore alignement at bullet release is, depends on how consistent the body manages the recoil, time after time.
Without getting into numbers and sequences, let's simply consider that the amount of sight correction most rifles need to shift zero from 100yd to 1000yd actually corresponds to only about 1/2 of a degree.
Contrasting this against the potential for variations of muscle relaxation and bias during recoil, and it becomes rather easier to contemplate what a total shift in body orientation can result in a POI deviation of roughtly 1/60 of a degree. 1MOA = 1/60 of a degree. Honest.
Actually, it demonstrates that precise marksmanship is about maintaining consistencies right down to some very small factors. IMHO it's amazing we can actually do as well as we do.
Greg</div></div>
I'm glad Greg has come into the discussion. Greg clarifies what's happening, if you want to put em all right-in-there, you've got to be consistent in relationship to the gun and ground from initial building of the position until recoil subsides. Most folks just do not get what perfection is demanded. If they did they would all be HM shooters.
Here' what is so funny, folks will perfect their equipment and ammunition and yet not contemplate that perhaps their relationship with all that stuff could be important too.
Considering that a zeroed rifle is one where the sight has been adjusted so bullets go where aimed, meaning ZERO displacement of POI and POA, I find it also funny how folks are so sure of a zero not changing with their position change without testing for it through group triangulation. After all, it's only through triangulation that the actual zero can be determined, since no one here, not even David Tubb, can indeed shoot all bullets without some shot displacement. For those who still don't get it, listen, the zero can only be surmised by identification of a group's center, adjusting the sight as required to eliminate the displacement of the group's center to the point of aim.
