@thenomain Ammo doesn't get lost, you just need to have tons devoted to it on the mech and the equipment 'slot' purchased to put in there. Once that's in there you won't need to replace ammo unless the location gets destroyed, because you lose all equipment on the destroyed location.
Vehicles range in weight as well, there are 100 ton vehicles also. You will come across vehicles that can and will threaten heavy and assault mechs. I've run into missions already that had enough PPC, SRM, and AC boat vehicles that I lost a Shadow Hawk to vehicles. Yep.
Battletech is a game where you mostly want to destroy the small stuff first, just to negate the amount of incoming damage you receive because it can get bad fast if swarmed.
Also keep your mechs within range to support each other, a lone mech is a lot easier to deal with than a lance of mechs.
@Ganymede yeah it is a little jarring, like AC 5's doing 45 damage instead of the same damage as a medium laser, or AC 10's doing 60 damage.
In general 1 point of battletech damage translates to 5 points of the game damage, but things are balanced a little differently.
It's still quite good though.