Headspace and Timing

[Pete]

That said, H&S is usually set in the beginning and verified as part of Pre combat checks prior to roll-out.

In retrospect that's something I should have been doing as the XO of a four-gun 175mm battery in 1980. The four M548 tracked cargo carriers in the firing battery had M2 .50-cals. Our main concern at the time was keeping the 175 rounds within 50 meters of our targets.