Quote Originally Posted by LongRange View Post
as the barrel heats up with repeat firing it causes the barrel to rise as it expands thus tweaking the barrel and action at that junction so you get a V shape so to speak not a straight line from chamber to bore/lands...i know it sounds funny but it happens especially when using devcon as your bedding...its basically steel that i would imagine expands a little with heat as well just like steel which would make the problem worse...this is why most ppl say dont bed past the lug with a target riffle.

the barrel can expand/move in any direction, not necessarily always up.
Could the POI moving up be attributed to increased speed of the bullet?