They might have used more powder, but they had less power to damage.
The questioon is overbroad, However, in broad terms, if you are referring to small arms, no. If you are referring to large guns, cannons, and artillery, no as well.
New guns and weapons
nothing
The DLC for key to the city gives you more guns. Also ranking up will give you new guns.
New Guns are intervention , fal, f200, acr, WA200, M21 EBR, and more
New guns have a better fire rate and have more attachments you can say. Old guns had horrible reloading and a lack of ammunition. New guns have enough and a good amount of ammunition.
The new rifled-barrelled artillery greatly extended the range of accurate fire.
Ironclad ships, landmines, submarines, observation balloons, repeating guns, and grenades.
Advanced ammunition casings, gatling guns, mini balls and other things
It's a replica. More replica black powder guns are made in Italy than anywhere else. I am not aware of any guns marked 'Made in Italy' being used in the Civil War.
some are gonna be new guns
Cannons, updated and more modern guns. The use of floating mines and iron clad ships also changed warfare at sea. Improvements in transportation with trains and steam ships made troops more mobile.
Soldiers often had to fight in bare feet! NEW RESPONDENT. The awful power of rifled guns, which massive volume of fire and range provoked large losses among the infantry deployed in line without coverage.