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