The extra capacity and weight are +50% (per the AToW Companion, page 161).
Regarding weapons on Support Vehicles: yes, they take up a slot (per Tech Manual, page 136).
got the weapons taking up a slot, what about their
extra ammo?
+50%, ... So that's +50% for the ammo included and/or for the extra ammo?
Edit: doh, should use an example that actually needs extended ammo
Drac Rifle:
8 shots
.007 t (7 kg) -- rifle
.050 kg (50 g) ammo
an extra extended clip brings it to 12 shots at .075 kg (75 g)
is there any weight added to the Rifle itself? TM rules say one clip (round/shot as per weapon description) is included weight free.
Would this one be .00725 t (or 7.25 kg) for the added rounds or do we get to keep the 'free' weight on it?
Finally saw this tidbid from p136 of TM pdf:
Regardless of their type, these weapons
require no heat sinks and come with a free clip; they may carry
ammunition in multiples of their clip size. (Small and Medium
weapons incorporate their ammunition into the slots devoted to
the weapons themselves, and require no added slots for expanded
reserves.)
So I can add in extra ammo for small weapons w/o using slots. Nice, was wondering if they can share ammo, but that is probably a moot point in TM terms, possibly AToW rules might need something specified.