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How much difference can a primer make?

I'll have to get back to you on the head stamps.
point being they are likely different.
Likely the powder is not the same or of the same charge even if it was
A lot of variable in factory ammo that will least to what you are seeing.......primer being just one.
All my primer testing has shown very little poi variance when all other components stayed the same , a change for sure in poi but not as much as you are showing
With spherical ball powder I see the least amount of variance going from a 400 to a 450 and the most with long stick powder

based on 100Y.....if we were talking the 600y line then yeah we could be talking several inches

ETA I looked back at the pics and the head stamps are in fact different.
Your looking at way more than just the primers being different, those two brass are going to release the projectile differently , probably have differing capacities ......
 
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