This
It is not possible to do an entire run and using guns that uses a lot of ammos.
If you have 4 players that use weapons like bolter (full auto mode), kantrael or lawbringer shotgun, flamer, autopistol etc. and that they don’t try to watch their fire, believe me, you will run out of ammo really soon enough.
The problem is not that. The problem is the ammo system. Your proposition will lead to a problem for the veterans. I repeat that we have toxic players that don’t care of the team and steal every ammo box they find.
I know that it is not realistic, but I tend to think that when picking an ammo it should give less ammos but shared between all the team. Off course, the fact that one player is full on ammos should not permit an other player to get more ammos.
Also, they need to increase the ammos reserve of several guns… revolver, shotguns, infantry autoguns, autopistols are the ones I think at first.
Then, here, I would agree to allow less ammo on maps.