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Old 01-23-2021, 12:54 PM   #7
Ten Point
Join Date: Feb 2013
Location: Tallahassee FL, fled the Californian invasion of Austin TX

Originally Posted by ORIONTHEHUNTER View Post
Both Tikka and CZ appear to follow the CIP standard. CZ says go ahead and use 5.56, because under the CIP standard it is safe. Yet, Tikka says don't use 5.56. My understanding is that the CIP standard accounts for the increased potential pressure of 5.56. As such, I am trying to understand why. I believe Bergara is the same.
From a textbook/legal/extreme safety standpoint it is correct that firing .223 in a 5.56 chamber is ok whereas firing 5.56 in a .223 chamber may not be.

However, the reality is that any quality modern bolt action is built to far exceed the pressures developed by 5.56 in a .223 chamber. A .22-250 generates up to 65,000 psi, while burning substantially more powder, generating more bolt thrust due to the increased case diameter, against a weaker bolt due to having more material removed to accept the larger case head.

If you have some off brand stamped sheet metal Brazilian made .223 it might be a problem, otherwise itís unlikely to be.
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