These figures are all in the 28mm scale range, which is to say that they range in height from 25mm or so (sole to eye) through 30mm or so (sole to eye), which is quite the range to be sure. Luckily, I'm not a stickler when it comes to scale.
Ian Croxall has a very interesting discussion of scale, conversion and "what fits with what" on his Red Shadow site, on the cast page. He also has a reference chart of some figure sizes.
I've included a few reviews of figures I own, and hope to expand this to cover everything bought (yeah, right).
As a quick summary of what you'll see here...In China, during the period covered, most of the British forces were actually from the Indian army, so there were lots of troops late of the Mutiny involved, which means that the figures aren't too tough to find, and can even be reused for (surprise suprise) Indian Mutiny games. Old Glory has a lot of Indian Mutiny figs, and so far all of my British foot are OGs. I'm not thrilled with OG cavalry, so I got my Bengal Lancers from Conosseur through J&T Miniatures.
The French are currently under-developed in my campaign. I only have one unit of French...the Tirailleurs Algeriens also know as Les Turcos. These were Algerians recruited into French service, hastily shipped over to China for service in the Opium War. No one actually makes Turco figures, but American Civil War Zouaves can pass in the dark with a shove. Wargames Foundry made Franco Prussian Zouaves who would be closer but they've been out of production for a while now, but hopfully they'll come back again.
The Chinese have two major groups to be represented. The Qing (Ching) Imperials and the Tai Ping Rebels. The Qing are all represented with (I think) the only Imperial troops on the market these days, the ones from London War Room. They're older figs, but nice just the same. The Tai Ping, again, aren't represented in the market anymore. Foundry used to do them, but they're OOP with no sign of returning. In their place I'm using Old Glory Boxers which are close, but technically should have long hair hanging loose rather than in queues. Again, I'm hoping no one will notice....
For Canada, things are both easier and harder. The British (or more correctly, I guess Canadians) are represented by the North West Mounted Police and the Canadian Militia. The Militia are pretty much just "Brits in sun helmets". In this case they're RAFM figures who are actually Canadian Militia. The Mounties are a bit harder. They wore a very distictive uniform and no one but RAFM makes figures like these, but even they don't do dismounted versions. Try and even find a figure in a pillbox hat anywhere!
Then there's the natives. Much easier. Lots of people make plains indians for use in fighting against American cavalry. The majority of the indians I have are from Old Glory (love those 30 figure bags!) including some mounted figures. Though RAFM make some fine looking plains indians as well.
I'm trying to have a representative sampling of figures here, though more may be seen in the reports of action off the main page.
Chinese
British
French
American
North American Natives
Others
Reviews