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 Slight confusion about about my CBTO measurements
#8241188
04/18/21 04:23 PM
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Joined: Apr 2013
Posts: 2,424
tenyearsgone
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I took some measurements of my AR-308 7-08 chamber and came up with an average length of 2.277. I then measured some loaded rounds and got 2.282. I’m having trouble understanding how I was touching the lands when the COAL for those was all under 2.800. I guess this is why this rifle has a tendency to show pressure signs. I’m going to set the CBTO at 2.257 to start.
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Re: Slight confusion about about my CBTO measurements
[Re: tenyearsgone]
#8241686
04/19/21 01:34 AM
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Joined: Dec 2008
Posts: 41,173
J.G.
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COAL being 2.800" and your touching the lands, and you're confused? Why?
Because a publication says 2.800 is maximum COAL for a SAAMI 7mm-08?
Whomever chambered your rifle did not get that memo.
The books mean nothing when it comes to CBTO and COAL. Only the chamber you are loading for matters.
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Re: Slight confusion about about my CBTO measurements
[Re: tenyearsgone]
#8241776
04/19/21 03:00 AM
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tenyearsgone
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Got it. All the test rounds for this week are set to 2.257 so at least they’ll all be consistent. I had some promising results from N140 and Big Game a couple of weeks ago.
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