I ran the above load again this week for a follow-up CHE check.
I shot two 3-shot groups which measured 0.70" and 0.61". I fired off the rest of my loads over the first two 3-shot groups, 4 more on the first and 2 more on the second. The composite of all 12 rounds was 1.27".
I'd reloaded the now once-fired cases I had used for the previous CHE check to see if there was any additional expansion over the .00038" average I measured after their first firing. Each case measured exactly the same after its second firing as it had after the first - no additional CHE. This is how I like to see CHE track on a good safe long-term load.

Cheers,
Rex