Now that SAAMI has adopted the Grendel, what did they list as the safe operating pressure? I have read, 45K psi, 50K psi and 52K psi.
Lets assume it's 50K psi. Why such a low pressure rating compared to other common AR rounds like the 5.56(62K) and the 6.8 SPC (58K).
I know the rim diameter of the Grendel is .018 larger than the 6.8 which may account for some of the reduced pressure rating, but what else? After all the 6.8 has a rim .044 larger than the 223 and runs at a higher pressure (+ 3K psi).
I guess I'm just curious, How was the 50K psi rating determined and with what type of equipment and or labs?
Thanks
Lets assume it's 50K psi. Why such a low pressure rating compared to other common AR rounds like the 5.56(62K) and the 6.8 SPC (58K).
I know the rim diameter of the Grendel is .018 larger than the 6.8 which may account for some of the reduced pressure rating, but what else? After all the 6.8 has a rim .044 larger than the 223 and runs at a higher pressure (+ 3K psi).
I guess I'm just curious, How was the 50K psi rating determined and with what type of equipment and or labs?
Thanks
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