Start with the condition of the brass

I record what the brass was before I touched it: the headstamp, number of firings when known, lot, and anything that looked unusual. That gives me a baseline before measurements start changing.

A clean record is more useful than a perfectly complete one. If I do not know the firing count, I leave it unknown instead of inventing precision.

Use measurements that answer a decision

Trim-to length, shoulder movement, loaded neck diameter, and seating measurements matter when they tell me whether the process stayed consistent. I do not add fields just because a tool can show a number.

• Keep lot and firing-history notes with the recipe
• Record the target dimension, not only the measured result
• Use the same measurement method when comparing batches
• Flag an outlier before deciding whether it belongs in the next step

Make the next session easier

The value of the baseline appears later. When a range result changes, I can look back at the component lot and the preparation record before guessing at a cause.