I've seen several dimension specs for 308 match chambers. What's the official ones?"they are NOT 308 factory size, they are 7.62 size"
Uh.....they are the same size.....your match chamber is simply tighter.
You joined this thread on your own. Nobody dragged you in.Further discussion of .30-06 pressure, military proof loads, the Garand and so on is off topic and I'm done being dragged into thread drift, thanks.
Bart, if you want to explore this further, why not start its own thread?
Commercial 308 Win match ammo by the thousands loaded to 52,000 cup SAAMI max pressures fired in M1 and M14 rifles as well as commercial semiautomatic rifles never caused any problems. Military 7.62 and 30-06 ammo was loaded to 50,000 cup average.Basically, the bolt action will handle the pressure differance between the MILSPEC nad SAMI ammo. MILSPEC cahmber sare dimension to handle the thicker case.
MILSPEC needs to have a thicker case, due to the rapid ejection of military chambers will under the resulting pressure.
SAAMI ammo will likely tear through the extraction groove/rim or pull the case head off.