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POA is POA but everyone's POI is different. It's all based on the above posts people left. Many variables for sure. If you put any given rifle in a vice so it's POI was zeroed based on that vice, each POI would be slightly different from human differences when shot in the arms of different people
This doesn't have so much to do with group size (precision) as it does with group location. (accuracy)
Maybe thats the case with new shooters but seasoned guys have their own way of shooting and that won't change. I'm always learning but I won't change how I shoot just cause I use someone else's rifle. I'd take it to the range, zero it in( make sure it's zeroed for me) then hunt with it. I'd put the zero back where it was before I re-zeroed it before returning it. New shooters need to be schooled so that's never an issue with them. Shooting from a rest and bags is entirely different than shooting in hunting scenarios. Holds vary also. There is alot more to it than just one discipline of shooting. That's probably why POI isn't always the same with every shooter and style of shooting if using the same rifle. For the most part, my shooting is consistent regardless which of my guns I shoot or which form I use. Groups may be off a little with each type but group size is usually pretty decent. My son shoots inside an inch of my groups with my rifles but not in the same exact clusters. Probably a hard or loose hold issue I'd guess. Can't really say.
I guess I meant it's more likely if your all shooting the same discipline, it's more likely you'd shoot closer than offering that same rifle to a person for another discipline such as hunting where the hold of the rifle would be different. Matches usually are the same (prone, bench, etc). I will say since the OP was shooting with his girlfriend and the two had different POI from the same rifle makes a little more sense to me than say two men shooting. Many women naturally shoot better than men. I can believe a difference in POI in men and women. When my son and I shoot the same rests and gun, we're close enough to hardly tell a difference. Very little change in group location. Could be a vision thing. I wear glasses, he doesn't.
If the target is large enough, making hits won't be a problem. The effect being discussed here is typically a 1MOA dispersion at most. Most typically it hovers around half MOA, representing 1 to 2 clicks on a typical optic.
I agree, an adjustable cheek riser that is adjusted accordingly between shooters would take a lot of the variation out most likely. But even still, there are a bunch of smaller factors that would effect it as well. Consistency is key, and if you can guarantee that each persons eye was at the same spot in relation to the scope, it should condense the poi's considerably. All else being equil of course. This is all just my observations and should be taken with a grain of salt.
I like this even though it wasn't between two people. Unfortunately I don't have a range over 100yds. Bullet was a 195 EOL running 2800 measured with LabRadar, es 22 over 30 rds, 0.5 moa or less if I do my part. I was messing around stretching out a new rifle in the field hunting. The hunt was really slow in the area so I decided shoot further than 250. I Shot to about 500 prone I was over 2 moa low. I was frustrated and tried to recalibrate my dope table using the drop. Well to tell the truth, I ended up going back to the original table after shooting out to 700yds. It was how I was mounting the gun. I believe more so with butt placement on shoulder. It changes how the gun recoils/deflects and bullet impact. I had to slow down and do everything the same way and my original dope table was good to 1000. .
I would attribute this to recoil, and that your controlling it or absorbing it more decreasing muzzle rise, I say this because I have the same thing happen if I zero in a lead sled that is sucking up the recoil vs when I shot off a bag or bi-pod the impact is higher. I have read that technically the bullet has left the barrel by the time we feel recoil so why does this happen? Milliseconds of time and thousands of an inch in movement is my guess = 1 minute downrange. It would be interesting to see what a ballistic calculator calls for, who is it closer to?
