br1111
Silver $$ Contributor
could be residual stress in the barrel and when it heats up causes the poi to change.Ok. So then I basically agree with the others and suggest checking the basics including that the barrel is fully floating and if you have another scope then swap it out. Check your base screws while you're at it also. If none of that helps it's probably time to check bedding or your load choice.
Since it's given you trouble with more than one barrel I'd look at bedding first.