fire form loads for a 22-243

[Okiecat]

I want to fireform 100 rds of brass. I don't want to run full power or use expensive bullets. Can I load a reduced load of faster powder and a filler with some light varmint bullets?? Need a suggestion and a starter load!! Trying to same barrel and powder. You don't have to fireform this brass but it makes the runout better if you do before loading match loads.

 

[Kenny474]

You can use cream of wheat and pistol powder to fireform, just don't use a bullet. I have never done it but I know many others do. I have read that you can use 10% of the case capacity of Unique and add powder in .5gr increments until the desired result is achieved. I copied the next part from the .243AI cartridge guide.
!!!Use at your own risk, I accept no liability if you blow yourself up!!!

The fire-forming method I have been using more lately employs medium burn-rate pistol powders and Cream of Wheat. I will start by loading about 10 grains of SR4756 or Unique into the case, and then I fill the case up to the body shoulder junction with Cream of Wheat. I will then take a large pinch of polyester filler, which can be found at any fabric supply store, or sewing department, such as at Wal-Mart. I will then take the pinch of polyester and load it into the case so that it fills up the shoulder area of the case effectively making sure that the filler is held securely over the powder for fire-forming. During the fire-forming, I like to dry brush with a nylon bore brush every 10 to 15 rounds. This removes any loose debris from filler that has accumulated. [Editors Note: Do NOT seat a bullet using this "Cream of Wheat" method. You can cap the case with a bit of wax to keep everything in place. However, Bob finds the wax is not necessary if the polyester filler is placed securely.]


This method is also discussed here: http://www.6mmbr.com/260AIforming.html