The Firing Line Forums - View Single Post

yggorf · January 8, 2013, 06:50 PM

It would be good to know if there is a "standard" for chamber wall smoothness (either measurable like "no scratch/low spot greater than .0005", or subjective such as "not visible under 5x magnification").

My scratches are much less than the thickness of a Lapua brass case wall - probably one tenth of that.

I'd also like to understand better the correlation between these kinds of chamber surface imperfections and accuracy. Do they matter at all?

I'm guessing no - but the next question is "what about feeding/extraction reliability"?

January 8, 2013, 06:50 PM	#10
yggorf Senior Member Join Date: April 17, 2009 Posts: 125	Interesting... It would be good to know if there is a "standard" for chamber wall smoothness (either measurable like "no scratch/low spot greater than .0005", or subjective such as "not visible under 5x magnification"). My scratches are much less than the thickness of a Lapua brass case wall - probably one tenth of that. I'd also like to understand better the correlation between these kinds of chamber surface imperfections and accuracy. Do they matter at all? I'm guessing no - but the next question is "what about feeding/extraction reliability"?