Do you use any mods?
Do you have this issue in all base camps?

Hi Astaroth,
No I have no MODS installed.
I have tried on other base camps but this only (so far) has happened on the 'Bomos' camp,as I say I can have ammo in my weapon,but if I swap for any weapon in the 're-arm' house,the ammo counter goes down to nil.

Did you try take new ammo after take weapon?
*Take any weapon from desk, you have no ammo, it is correct, when you take weapon with different type of ammunition than weapon before.
*Go to box with ammunition sign and take ammo, you can use action menu and rearm function

Hi,
Yes,that was it,sorry I did not see the 'Ammo' box on the floor.

No problem, thank you for info.