No, I'm not. All of the objective evidence I point to can be determined with zero knowledge of what a gun is.
Yes, and the wound will show how much force it took to produce the wound, the density of the weapon that produced the wound, and the cross section of the weapon. The bullet left from the wound will tell you that it was in contact with a metal tube as shown by the striations on the sides of the bullet. The chemical traces on the bullet will tell you the chemical make up of the propellant. The damage that the bullet does, as well as the deformation of the bullet, will tell you the velocity it was travelling at. All of this can be determined without knowing what a gun is.