I agree RC, the barrel is going to sweeten, condition, break in on it's own over time just as it is going to wear out over time. If there's a precaution that should be taken it's to not overheat the barrel.
I can tell when a barrel gets to the sweet spot and that's when I start seriously working up loads. Before that I usually shoot up the factory ammo that I have that doesn't really shoot all that well in any of my other rifles.
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