What degree does gas exit?

dano1955 · Sep 6, 2012

Going to crown a rifle barrel and need to know what degree does gas exit?
Was told they are using this as per NASA information as opposed to a 90 degree crown.
Dan

Whovian · Sep 6, 2012

What?

mrspeedybob · Sep 6, 2012

Your question makes no sense. I suspect you are using gun-smithing jargon mixed with very bad grammar. Could you please restate the question using common English terms and correct grammar?

berkeman · Sep 6, 2012

dano1955 said: ↑

Going to crown a rifle barrel and need to know what degree does gas exit?
Was told they are using this as per NASA information as opposed to a 90 degree crown.
Dan

Welcome to the PF.

There are lots of resources to help you with deciding how to crown your rifle barrel. Google turns up lots of them:

http://www.google.com/webhp?sourcei...&bav=on.2,or.r_gc.r_pw.r_qf.&biw=1234&bih=865

It would probably be more productive for you to read through the hits on that Google search list, to look at the tradeoffs for the different crown angles and styles. As the bullet leaves the end of the barrel, the gasses will expand out at a pretty steep angle. Probably not all the way to 90 degrees (for the highest velocity flow), but probably pretty close.

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What degree does gas exit?

dano1955

Whovian

mrspeedybob

berkeman

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