Nope. Here are the current CIP max average pressure standards for the .450 No. 2 NE and a few other Nitros:

.450/.400 3" NE.......................40,610 PSI
.450 3 1/4" NE.........................44,236 "
.450 No. 2 NE...........................40,610 "
.470 NE......................................39,160 "
.475 No. 2 (both)....................39,885 "
.500/.465 NE............................35,534 "
.500 3" NE.................................40,610 "
.577 3" NE.................................35,534 "

This is chamber pressure measured by piezo electric transducer. Differs a bit from what most people assume.
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