Everything below 11 mm is OK. Otherwise, I'd say everything but nukes and anti-matter is fine. They're just standard rounds. Even the plasma rounds I'll buy -- but not at less than 40 mm. Even Yamatai doesn't have plasma grenades.
Someone else can argue nukes in 41 mm rounds and anti-matter in 30 mm rounds.
My other request is that, while it's nice that you were really thorough, you need to be more specific. I'm sure they don't have a 21 mm round, a 22 mm round, a 23 mm round, so on. Pick specific calibers for specific weapons. The generalized, linkable approach is still good, but you should really pick and limit from there. This is a real spam approach.