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Fireforming 223 brass in the 7mm TCU.
14” Thompson Contender at 100 yards.
Will be interesting to see what happens when I reload this brass after fire forming it.

C83C7B8C-F997-47E7-91B6-BDF18715BFE1.jpeg
 

DizzyJ

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We need to stay in contact. I've got a similar setup and will eventually be getting one of these barrels. I think it might be a good way to go!
 
I don't bother trying to gauge accuracy when fireforming. When converting from another cartridge, I have found it takes two firings to completely shape to your chamber.
 
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