Anybody still measure case head expansion as a way of seeing pressures?

I have came to the conclusion that its not worth it. I think the only way it can be done is to measure a "new" case before and after firing and seeing the change.

I use a set of starrett mics.

I did a test this weekend, where I was building up a load for my STW. I took the load up in 0.5increments until I felt heavy bolt lift. The cases were new winchester cases. For the most part, I seen 0.0005" case head expansion with the "heavy bolt lift" cases. With the others, for the most part, I seen only 0.0003" or less. So I feel the theory is sound. But several cases did not coorelate the mic measurements and pressure signs.