Woops . . . I missed the low pressure part. Sure, if you're already loading low pressure, you're good to go.
I don't know whether Ithaca's switch from the Flues to the NID came as a direct result of the Super X, but the timing is about right. After Savage acquired Fox, they supposedly lengthened the chambers on all guns returned to the factory for work to 2 3/4" as a matter of course. Guess that shows they thought their short-chambered guns were good to go with the new, longer, higher pressure loads.
