Why did changing buffers change my POI?

[Klem]

by changing buffer you changed timing of your rifle. That affected extraction, recoil, barrel harmonics and changed poi.

Try changing bullet weights and you will see poi change. Try changing powder charge and you will see poi change. Unless you have super thick barrel - any timing change will shift poi.

Please do not do this. The reasoning behind this advice belies the fact that the bullet has already left the barrel - consistent with the majority advice on this and other forums.

peole, I see you joined the Forum in 2019, yet this is your first post? With that confidence you'd be at 1,000 posts by now.