Survivable Musket

[TGLS]

Well from Wikipedia:

Though the armour could not protect against contemporary flintlock musket fire, it could deflect shots fired from long-range, stop ricochets and offer protection from all but very close range pistol fire.

Taking long range as past 1/2d range, it seems like the cuirassier has it covered. Big pistols can even be shrugged off at close ranges. Going more than that might make muskets too survivable.