"Clickers" (PE failure) for the average hand loader is an "oh sh**t" moment....too hot of a load....period.
Competition shooters with better barrels, better chambers, better tools and more experience sometimes will "push" this envelope a little, within reason, to achieve optimal tune and results.
Back to the average guy, off the shelf barrels & dies most often work well together providing loads are kept at reasonable levels.
When the "clickers" develop when everything proves to be "normal", or even with mild loads, then equipment ie; barrel, chamber or dies should be looked at. Most times a slightly generous (or egged) chamber that causes this can be cured with small based dies (not ideal).
Some barrels themselves are prone to cause higher pressure that cause enough chamber "swell" during firing that the brass doesn't springback enough. Although not common it has been reported in short mags more than other cartridges.
Yes "clickers" have been around a long time and usually noticed most by handloaders. When the guy says only slight pressure signs like "mild bolt lift" or "small ejector marks" he is most likely way above "safe" working pressure.
Most often related to the handloads themselves. Never rule out the sizing equipment or methods. Out of spec dies or maximum tol dies may fail with "tough" brass of one brand while work fine with another. Also expect changes in sizing results as brass work hardens with firing cycles because the springback also increases.
My .02,
Randy
Edit: agree with Mikecr, I was typing while you posted.