How accurate is my rifle

[Drifter]

I subscribe to the "cold bore shooter" concept more than the cold bore rifle.

I don't disagree with you, but can assure you that some bullets and / or barrels are more prone to cold-bore fliers than others. Take more than one rifle or upper to the range, practice with one, then switch to the other to test the theory while eliminating the "cold-bore shooter". Use some bonded hunting bullets with the bore left fouled from a previous trip with the same load.