but just pretend that it is, and bullet wounds have just received more realism, dont bullets work by leaving shrapnel in your body,and if they do, wouldnt being made of 200 year old metal make them splinter more,cause more damage, and annoying wounds to stitch up?and while we are on this topic, how do bullets work 200 years later,and how do you think there damage would be after 200 plus years?

Some bullets are made to explode upon impact with something hard, like your bones. But most simply flatten and deform. A hollow pointed one will deform out to a greater size, making a bigger hole. The high velocity bullets strike with will shatter bones when they hit them, which can be truly horrific. This is the reason amputation was often the only option with U.S. Civil War gunshot wounds. Back then reconstructing a bone shattered into a dozen or more fragments was impossible, and leaving all those broken bits of bone in there caused gangrene, which was fatal once it spread to the torso.

The vast majority of ammunition in the wasteland was manufactured post-war.

Bullets can last a very long time depending on how they are stored. Just last month I was firing rounds from World War 2 through by Dad's M1 Garand.

But the older the bullets the more likely defouling will become a problem faster which means you have to clean your gun more.

So after two hundred years your weapon is going to degrade faster. Which Bethesda did put into Fallout 3. But remember people are making new ammo.