Classic British Flight Sim

Hi All,
I actually made these 20mm cannon replicas about this time last year.
Suddenly the invasion of Ukraine happened, and I felt it was unseemly to post at that time.
Sadly, of course, the saga continues, and after last year's health issues, I've decided to go ahead.
I have since re-designed the projectiles, but haven't printed them yet.
There is one or two more, not pictured.
I'll make this a mini-quiz, too; what do the colours and markings mean, and what is the particular property common to all four, (apart from not looking exactly realistic in that harsh sunlight)?

They look pretty convincing to me, Mike. Couldn't tell you what the markings mean, though the colours remind me of different types of fire extinguisher, oddly enough. Is there anything you can't 3D print these days ?

This is a bit like throwing darts ,in the dark, while wearing a blindfold... So I'll just toss a few..

On the question of a commonality all have . I'll say they are all anti-aircraft, munition
and are brass colored
The color coding designates whether they are explosive, armor piercing, their size and effective range .

Note:
The round at the bottom is missing it's ejector ring..

Thanks for the responses.
I'm not happy with the brass finish, it's too much like fine glitter, probably will try the antique brass.
I'm putting the Spotter results up tomorrow, so I'll do the same with these identifications.
You're kind of on the right track, Joe.

For those interested:
Top (1) Solid bullet
(2) High explosive/ incendiary
(3) Tracer [T with two arcs over it]
(4) Incendiary
They are all 20mm Hispano rounds.
They all have white tips, meaning armour piercing, the slightly smaller white tip on (4) indicates semi-armour-piercing.
Oerlikon rounds used a slight variation.
The USA used their own colouring system, some matching Commonwealth, some not.
There are further identifications around the detonator.

Its funny Mike, but I imagined they were much larger than 20mm. What would dictate when each type was used?

TSR2 wrote: ↑

14 Jan 2023, 10:38

Its funny Mike, but I imagined they were much larger than 20mm. What would dictate when each type was used?

They put a mixture into the drums, or later, belts, Ben.
I think that the armourer decided on the sequence and mix, depending on the intended targets.
Here's a shot of the blunt end of a couple.
IRW, the stamping is finer, but when I made the characters finer, they just got ignored by the printer.
I have to allow for using entry level equipment

The detail you manage to get is superb Mike

TSR2 wrote: ↑

14 Jan 2023, 12:01

The detail you manage to get is superb Mike

Thank you Ben