Fireforming

Hikinghunter · 2024-10-25T08:18:47-0500

Howdy. I'm doing load development for my new custom build. When I installed the barrel, I headspaced within .001 of my virgin brass length. As such, I'm not seeing any shoulder growth in my once-fired brass. I assume this makes fire-forming moot for this brass/rifle? Or is the brass still fire-forming to the chamber, just not lengthening?

Tiny Tim · 2024-10-25T11:32:06-0500

Alot of times it will take 2,3, or possibly more firings before you have to bump the shoulders back. It's likely still forming to the chamber.

Hikinghunter · 2024-10-25T11:37:01-0500

Tiny Tim said:
Alot of times it will take 2,3, or possibly more firings before you have to bump the shoulders back. It's likely still forming to the chamber.

Ok, but why would the shoulders move at all if there isn't much room for the brass to expand inside the chamber? If I put a piece of tape on the back of the brass the bolt won't close, so maybe 1thou of headspace.

GSRetrievers · 2024-10-25T11:41:01-0500

Shot the same brass without hitting the shoulder sizing, you'll find the answer to your question in the next firing or two.

Fireforming

Hikinghunter

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Tiny Tim

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Hikinghunter

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GSRetrievers

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