Temperature increases the RATE of a chemical reaction, which is why loads that work on a 40* day will extrude brass on a 110* day in the sun, not the AMOUNT of energy.

Looking at that Mauser bolt that had the lugs sheared off; unfortunately people aren't very smart these days, lots of stupid going around, and they do not read the loading manuals and load to velocity, they load to what is in the book and wonder why things go wrong.

The only way to truly know what is going on inside your rifle is to use pressure testing equipment such as Pressure Trace and a good chronograph like the Oehler 35p.

Good article.
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Better living through chemistry!