Well, look at it this way. many people shooting from bipods are shooting well some 1/4" groups, but many under 1/2". BR and F class guys using front rests and heavy-eared rear bags, tighten that way up once the loads are working well.
If I did my math example 1/2 way correct, an incline change across something like a 6" 20 MOA rail gives you 1" of POI change at 100 by being .0016" thicker on one side or about .0008" up or down from the center point of that rail. Guys shooting the groups above could absolutely see a change if their groups were an overall 1/4" bigger, correct. If we did the same math for a 26" barrel it be .0072" higher at one end for 1" on target or about .0018" for the 1/4" addition to group size. Realistically the barrel is making that change in lets a far less than 1/2 its length, so a variation of .0009" or less would do the same.
100y is 3600" =- I could have used MOA 1.047" but why convert only to reconvert to inches of change on target.
Let's just say my math is 100% wrong. Either way, ever seen anyone put a magneto speed on only to have the gun shoot smaller groups? I had a Remington 6.5CM factory gun I bought as a truck gun. That damn thing would not shoot better than 3/4" with any ammo or shooter, with the magneto speed on it was a 1/2" gun! It was a running joke amongst my buddies to just permanently attach the bayonet.