[quote=@Lauder]
[@Zugzwang]

It is like early mid-nineteenth century at 1845-1865
[/quote]

[quote=@Zugzwang]
Oh I need to edit my sheet then, slightly.

>no maxim gun
>no quick-firing cannon
>barely any brass casings

This makes me sad.
[/quote]Yeah, 19th century tech is weird because it only picks up near the end.
Mid 19th century is basically almost like the Napoleonic era.
There are some distinct differences like gradual spread of breechloaders and the Minié Ball but that's quite a massive kick in tech.
1980s would most likely make more sense, IMO.