I have this promotional item made from a cartridge:

This is a fired brass Prvi Patizan .303 case headstamped “PP 60 VII”. Oddly, it has been resized in a .308 Die and fitted with a 7.62 NATO Spec bullet, probably because it was cheaper. If you look closely at the neck you can see a definite step where it has been necked down to take the smaller diameter bullet.
It has “CHOCKS AWAY!” printed on the side in black ink, above the web address “www.eclipseglobalevents.com”. This is advetising a corporate team building exercise, which involves building a lifesize model biplane from dowel, paper etc. It can be seen here on the company’s website.
I got this from the London Airshow in 2005, which is a static trade show event for light aircraft and related items/services held every year at London’s Earl’s court exhibition centre. I thought this would be an interesting day out as I have always been interested in aircraft of all kinds. The Chocks Away event was being advertised there, with an example of the model biplane. about 20 of these cartridges taped to paper strips had been used as ammo belts for the (quite well made) cardboard and tinfoil Vickers machine guns of the model biplane.
The guy who was handing out these cartridges told me it cost more per round to get them printed than the dummy cartidge itself, but I do not remember the exact cost. It may well have been 20p per round and 35p per printing. I ended up with three of them, after looking through the ceramic bowl they were in for various headstamps. One was “RG 55 7”, but I cannot remember (or find) the other.