Does specialty ammo get halved per bin on vehicles or totaled at the end?

[PhoenixHeart]

Page ref: TM p.346 (table, footnote)

TechManual states for the

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** footnote to round damage up and all other numbers down, which includes shots per ton. Since Combat Vehicles store all of their ammunition in a single bin (per type) and do not track each ton separately for crit purposes, do CV's round ammunition per ton, or just once at the end?

Practical example:
If a Saladin swaps all 3 tons of it's AC/20 ammunition for Precision AC/20 ammunition, does it have 6 (2+2+2) shots or 7 (15/2) shots available?

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Additional question, if vehicle ammo bins get divided at the end because they share a bin, does this also apply to SuperHeavy mechs mounting 2t of ammo stacked in one crit slot?

For example, would a 150t mech that has 2t of Tandem SRM's in a single crit slot have 14 or 15 shots of Tandem in that slot?