In the bottom right corner of screen right next to the ammo info/count, there's a little icon that shows mainly a tank turret in the background and in the foreground arrows going up and down. I have no idea what this means, but I'm guessing it has something to do with the ammo types being used. Do you know what is or what it's used for?
This is the gun gyrostabilizer (in the vertical plane only), installed on Shermans and some other American medium tanks. Though you can't do accurate fire while in move, but it significantly decreases time needed for gun stabilization after tank stops, hence you can make accurate shot immediately after the stop.
Now, in response to the ammo switching that you are talking about. I know how to switch when you only have two choices, such as W or S for AP or HE. I have trouble when I have three choices, I don't know how to select the middle one. For example, on the 75mm Japanese infantry gun, you have HE- which is W, HEAT- which is S, and then you have Shrapnel- which looks like a period ".", but every time I press period it doesn't work. What key does the dot represent? Thanks for answers
I'll just quote FHSWdev's Twitter there:
Some of the guns allow to switch between 3 kinds of ammunition. Keys needed
for this action are shown on the vehicle's icon, on the lower left area
of the screen. Sometimes they are W, S keys and sometimes arrows.
Example for HE/SHRAPNEL/AT - to use Shrapnel press and HOLD a W key when shooting, for HE press W once, for HEAT press S once.