I didn't miss your point because it wasn't written there to miss
Aha! Consistency is something different altogether, and will only come when you have a dedicated team of refs who work together on a regular basis, who maybe have had some sort of training.
Bear in mind chrono/gun judges don't normally get training aside from 'on the job', and what they've picked up over the years themselves (you will only get consistency if the series or an organisation trains the refs all the same).
The rules offer some guidance.
16.05 Marker Checking Procedure
- Mechanical Bounce Test - Markers will be tested for mechanical bounce by a bumping
or jarring of the marker. Markers will be held by the rear of the main body and bumped
on the tank or hopper. No contact will be made with the trigger. The marker will be
deemed to have mechanical bounce if the marker fires during the bump test.
- Trigger Bounce Test – Markers will be tested for trigger bounce by firing the Marker
normally. The marker should only fire one ball per trigger pull. A marker which fires
more than one ball per trigger pull is not legal. The trigger must be pulled normally and
not flicked or pulled slowly as this is not normal. If on pulling the trigger the marker fires
more than one ball then the player should be given time to adjust the marker or change it
with a spare time permitting.
- “Runaway Guns” Test - All markers will be checked for “runaway” triggers. The
marker will be fired rapidly. The testing judge, while rapidly firing the marker will
suddenly cease to pull the trigger. Any marker that fires more than 1 additional shot after
the final trigger activation, with a maximum delay of 100 ms, will be deemed to be a
“Runaway Gun” and will not be allowed on the field.