Dave,
Just so you know, I'm 70 and I shoot bench and supported prone (ie bipod) better now than I did in my 20's. I can't do position anymore due to tremors, but, I did keep getting better until I hit my 60's. Mainly because I could practice more since I had more funds available.
If you just go look at their web sites many of the barrel makers describe their processes. Krieger for example specifies that the do NOT heat treat a barrel, before or after rifling. Their claim is that their rifling process induces no stresses that need to be relieved. The vendor they receive the barrel steel from makes it to spec with any necessary heat treating. Krieger does a thorough QC on them to make sure it meets their spec.
Sorry it is not anecdotal but you can read it yourself on their site.
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