Ah! found it.
J. Pratt Air Law Operational Procedures Communications LAW131-132
Carriage of weapons and munitins of war:
.... or sporting weapon... not accesible to passengers and must be unloaded.
<presumably a 'Keep Out' sign woulf be okay in the back of a Cessna>
Carriage of dangerous goods:
. The carriage of securely boxed sporting cartridges is allowed; up to 5kg per person.
Sounds quite a lot of cartridges to me.
30.06
Basildon safe from 200ft ? vertically maybe.
Carriage of dangerous goods.