I bought an RCBS precision mic for .308 Win. I was reading the instructions that came with the box and was informed of the minimum-maximum headspace for .308 which is 1.6300-1.6400
I measured 10 unsized cases that were fired from my rifle. Here are the measurements (the figures below +1.6300):
.002
.001
.0015
.000
.002
.001
.003
.002
.001
.002
Getting an average from above measurements gives me a chamber headspace of 1.63175 which I will round up to 1.632, since the instructions say I can/should bump the shoulder back .001-.002
Am I doing this right? Is my chamber headspace the ANSI minimum of 1.6300? Because bumping the shoulder back from the figure above does give me that figure to work from. Thanks all.
I measured 10 unsized cases that were fired from my rifle. Here are the measurements (the figures below +1.6300):
.002
.001
.0015
.000
.002
.001
.003
.002
.001
.002
Getting an average from above measurements gives me a chamber headspace of 1.63175 which I will round up to 1.632, since the instructions say I can/should bump the shoulder back .001-.002
Am I doing this right? Is my chamber headspace the ANSI minimum of 1.6300? Because bumping the shoulder back from the figure above does give me that figure to work from. Thanks all.