There other types of autocannon ammunition, but they are utilized with entirely different guns, usually with explosive side-effects. The two that come to mind are Caseless Autocannons and Hyper-Velocity Autocannons. Both these weapons were featured in the Tactical Handbook.
Caseless increases the number of shells per ton by ~50%, but, there is a chance the weapon blows itself up when it fires as the exhaust cases detonate the next shell in the chamber. (I know, not very practical, which is a reason you don't see them very often.)
Hyper-Velocity Autocannons extend the autocannon range by anywhere from 33-50%. They are heavier than their standard autocannon counterparts, and, like caseless, they can explode when firing as the special gelled propellant causes a catastrophic detonation in the firing chamber. They also fill the area behind the mech with smoke and produce vastly more heat.
The original point of this post more closely aligns with Caseless ACs in that they have more ammunition per ton of ammo than standard battletech. Are we looking at having ammunition levels akin of MW4:Mercs, where a gauss rifle comes with 16 shots (2 tons of ammo) for only 1 extra ton, and an AC/20 is sporting 20 shots (4 tons of ammo), for only 1 ton?
Or are the CBT ammunition levels going to be balanced around them being a fraction of the cost of their energy weapon equivalents, thus making them less optimal tonnage-wise, but more cost efficient.
