Be more specific.. whats the problem exactly?

my ammo disappear sometimes when i fire my guns,.whats the problem with it?

Your bridge operator ability isn't high enough to see your shells at that range. Add some vets and experts on your BO or just continue to level him. It will go away as he gains experience. The game still tracks the shells that disappear so you can still score hits.

thanks for the reply,...

those dotted gun sight lines are produced by the BO .. not the gunners ...

if you pay attention you might notice the shells dissappear after they cross past the end of those lines
as stated in a reply above .. teh BO is teh one responsible for marking your shells ...

BVE you BO .. or simply level up ..... or ...... go back down to a shorter ranged gunset that your bo CAN see ..

its kinda hard to adjust your aim when you can't see where your shells land ...
BO needs bigger binoculars = LEVEL UP
or BOOST up (BVE) .... with one word of warning ....
(at higher levels a BVE BO will need to be trimmed to nerf super-long sight lines)

i just stay with a lower level gunset ... allows the BO to mark shells ..
AND .. helps with better spread as they are under your gunner level ...