Saturday, April 04, 2026

And something stayed the same

Friend wondered if my .300 Blackout might have a tight chamber/bore and that's why those Federal rounds were faster than listed?

Today had a chance to put three out of a Ruger American bolt rifle, over a chronograph.  

Nope, same velocity as the ones before.


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2 comments:

  1. Ken in GA5:42 PM

    I’m newish to reloading I know barrel length can affect velocity, can chamber dimensions do that as well? Even at sub-sonic?

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  2. Firehand5:53 AM

    Yes. A tighter chamber means less space for the brass to fit into, which can mean higher chamber pressure, and a bit higher velocity. In a bad case can mean problems extracting at times as well.

    ReplyDelete