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Old 03-12-2008, 05:33 AM
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Saami Breech Pressure Standards

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What is the standard working pressure in PSI for the .308 Win. and the 7.62x51 Nato. I know that the cartridges are simulas and the differences is the neck length and maximum opperating pressure of each load.

Can someone happen to know the answer?

I have a Spanish FR-8 (it is a 98 action, not a 93 or 95, deffinately a 98 Mauser action) and I have been shooting 165 gr factory loads in it and not a bit of problems or any signs of over pressure. I have been shooting this for 7 to 8 years 3 to 5 hundred rounds a year average. I would like to get an idea how much abuse I have been giving this rifle if any.


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Old 03-12-2008, 08:12 AM
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7.62x51 NATO - 50,000 piezo psi max
.308 Winchester - 62,000 piezo psi max

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Old 03-12-2008, 03:00 PM
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MZ5 MZ5 is offline
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Is the NATO pressure measurement point in a different location from the SAAMI pressure measurement point for 7.61x51/.308 Win the way I think I understand it is different for 5.56mm/.223 Rem?

EDIT: I forgot to post this very different pressure limit of 60,200 psi pubished on Wikipedia for the 7.62x51 NATO. That is compared with a 62,000 psi limit for the .308 Winchester on Wikipedia. Also, SAAMI does not list the two cartridges as a dangerous combination when ammunition is cross-chambered, which argues against there being a 12,000 psi pressure limit difference.

Last edited by MZ5; 03-12-2008 at 05:51 PM.
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Old 04-10-2008, 02:49 PM
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see here
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