Different POI between shooters

[spruilldog]

Is it common for two different shooters to get different points of impact with the same gun and same set up with same ammo? My son and I were shooting this weekend. Same gun on a solid rest. Both of our groups were about the same at about 1-1.25" on average. His groups were consistently lower and further right than mine by about 1.5-2". Again, group size was the same but POI differed consistently (three groups apiece). This is his gun so we made scope adjustments to put his groups where we wanted them.

[hogdogs]

Try this... You fire the gun with 2 or 3 different head positions and see if your POA/POI varies...
Brent

[sundog]

Not unusual at all.

[jmr40]

Fairly common when shooting iron sights, less often when using scopes. I'm guessing you are monnting the gun differently and parallax is the problem.

[Art Eatman]

To expand on the above: Odds are that your son's different hold on the rifle has his eye in a slightly different location with respect to the centerline of the scope. It takes very little parallax for there to be a slight difference in POI.

I check for any parallax problem by sandbagging the rifle with the crosshairs on some target-point. Then, if the crosshairs appear to move around on the target when I move my head a little, I know that I need to do some sort of adjusting (if possible) or be sure to be uniform in how I mount the rifle to my shoulder.

If it's only an inch or so on a hunting rifle, I don't worry about it.