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"How much is a years supply though?

Depends on if you're talking about peacetime, civil instability, collapse, invasion, or civil war.

All of those scenarios are different.

And it depends on if you're talking about the public as a whole, or individuals.

If individual, are you talking survivor, fighter, doomsday prepare in a cabin somewhere, individual guys in a military unit, what?

If talking about the public as a whole, it depends on the previously mentioned context.

And if you determine the context, it depends on the intensity of the conflicts (frequency and ammo usage) and what percentage of the public is active.

For example, in the context of an invasion (afhganistan), the u.s. used something like ten thousand rounds per 'insurgent'. But that was with the goal of killing OR capturing. So there was a LOT of suppressive fire involved.

tl;dr not enough information to say.

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How new?

I mean, yes, having a shitload of power on demand would make those a lot better. An incremental improvement in batteries will only make them sort of better. At double the capacity and output of a li-ion, I'd say you're still not looking at a practical rail gun.