You are right.
I was zeroing the scope and testing the rifle. And got carried away. That one time. Cleaned it, took back to the range for 3 control shots. She was good.
One question though: how does an AR barrel not get screwed from rapid fire?
Forgot to mention I've owned an A Bolt, a Steyr, a Savage, a Moss, two Rems, all in 223 or 243. None was heat sensitive like the Tikka. Well it could have been just my Tikka, which may or may not have been the reason why it was sold to me like new.