What does temp stable mean?

At -40, It's closer to .001" on a 1.00" diameter object. Which will actually generate more pressure. More so on 416r stainless.

When I shoot the old .283" Norma bullets in my 7mm WSM, and I shoot the exact same bullet, but the newer .284" diameter bullet. The newer one creates more pressure with the same powder change.
 
Alot of CNC mills use thermal expansion to hold the endmills/cutter in the tool holder now. Nothing more than heating the holder, placing the tool in, cooling it off, then chucking it up and using it. You can use it in manual mills as well. Has very minimal runout, and uses the same principle of thermal expansion.

Holding your micrometer the wrong way, or too long results in a improper reading as well. Metal contracts and expands way more than you think. And a typical mic only ready down to .0001. the larger the mic, the more it changes, and the more improvement it is to use it right, and have the environment you are in temperature regulated.
 
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