Pairing down, if you can only keep 3 ARs.

[MarkCO]

Curious as how you arrived at thermal drift vs whippiness of barrel.

Lots of testing is the bulk of it. When the barrel heats up and the group sizes are the same, but the center moves, that is one indicator. Temperature measurements combined with the metallurgical properties and vibration analysis is another indicator. Inductive heating of the chamber alone, and seeing progressive change in POI due to the heat transfer is another indicator.

[Erni]

... Inductive heating of the chamber alone, ....

Inductive or induced?

Yarg!