Gun is shagged, needs a service.

Gun has just been serviced, needs time to wear in.

Scope's broken.

Scope is moving in mount.

Scope mount is moving.

Scope is shooting to different POI on different mags. Bloody scope.

Silencer clipping.

Something to do with parallax.

Barrel harmonics.

Barrel needs a clean.

Just cleaned barrel, needs to bed in.

Barrel must be bent.

Cant.

Bloke next to me on the range put me off.

Too much coffee.

Not enough coffee.

Must be a duff batch of pellets.

Something to do with seals.

Trigger lubrication.

Getting tired.

Barrel harmonics.

Sun.

Clouds.

But never: poor technique, not focused, maybe a bit hungover, thinking about work or other stuff, out of practice, or generally just having an off day and should either man up and shoot properly or pee off and do something else today and come back some other time.