Code:
AddAmmo = Round
   InstanceName = Round Gun Template
   ParticleCount = 1
   Particle = MOPixel
      InstanceName = Particle Gun Template
      Mass = 0.008                < Take this  And make it bigger 
      RestThreshold = 500
      LifeTime = 1500
      Sharpness = 250            < Take this, and make it slightly bigger 
      HitsMOs = 1
      GetsHitByMOs = 0
      Color = Color
         R = 143
         G = 143
         B = 143
      Atom = Atom
         Material = Material
            CopyOf = Bullet Metal
         TrailColor = Color
            R = 155
            G = 155
            B = 155
         TrailLength = 25
   Shell = MOSParticle
      CopyOf = Gun Template Casing
   FireVelocity = 80            < Take this and make about 100 
   ShellVelocity = 10
   Separation = 5
Mass = Will add to recoil, but adds to the wound size.  May make it possible for the bullet to leave an entry, and exit wound *go all the way through* And the higher Mass the more damage the bullet does to terrain.
 Note: Too much and the wielder may explode upon firing
Sharpness = Will cut through things with higher sharpness, but may also do more damage, and doesn't add to recoil
Fire Velocity = Bullet fires faster or slower depending how high or low it is.  
Try to even out the damage and Recoil by varying the Mass and Sharpness.
And you may even want to change stuff for the Tracer too, but it may be too much damage.