Time to figure out what powder will replace 700X for your loading. I would guess Competition or Nitro100NF or Perfect Pattern might be great to replace it.
When Hodgdon replies to inquiries several months in a row that the powder is not being produced now, that it is NOT discontinued permanently, but that they don't have any ETA (estimated time of arrival) for it returning to production, I would look for something else! Especially if I were using, say, something like 16 pounds a year.
This is the time when we need to get real flexible and creative, instead of real mad. IMHO. We are not likely to change the war-time footing that we are on.
So, unless you want to pound the sidewalks looking for estate sales from old clay target shooters, and you are willing to deal with open-powder-bottle concerns, then you need to adapt.
good luck, garrisonjoe