How to Fireform Brass

Fireforming brass casings is the process of shooting a particular case at a minimal powder load in a specific chamber. The internal pressure --- when fired --- causes the brass to expand and fill the rifle chamber, resulting in a new size rifle case that can be reloaded and used again in that same chamber. Many reloading enthusiasts fireform brass to fit specific weapons for certain shooting needs. Fireforming brass can be accomplished with little difficulty.

Things You'll Need

  • Reloading press and sizing dies
  • Rifle brass and lead
  • Reloading chart
  • Rifle
  • Target
Show More

Instructions

    • 1

      Set up your reloading press. Resize the brass case with a resizing die to the dimensions you require for your chamber. As all reloading presses vary, consult your manual for instructions.

    • 2

      Consult a reloading chart for the cartridge you've sized. Select the most minimal powder load recommended for the bullet weight you are using for the case. Fill the case with the minimal powder load. Seat the bullet onto the case using your reloading press. As all presses vary consult your manual for seating instructions.

    • 3

      Load the new cartridge in your weapon. Aim at your target. Fire the weapon. The internal pressure from gasses expanding within the case during firing will cause the brass case to expand and form to the weapon's chamber dimensions. If the case is still intact after inspection, it can be reloaded and used for the same chamber.