Oh, what? Firearm? Well then, always the most accurate thing. Sometimes as a Cossack I like to go with two pistols, though.
And swords are useless if you have a musket. You can just smack the enemy to death with it.
Blunderbus. BLoody loved it in the earlier version where you could use it at long ranges and still hit more or less everything :3
Stop trying to snipe with the damn blunderbuss, Mikkel!