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Hodgdon isn't listing H4227 among their powders on their website. That says to me that it's discontinued.
Loading data in print can have a very long life. With some less popular cartridges, you'll see the publishers of manuals reprint the same data for 2 or 3 editions of their manual, so the new manual you bought last week could actually have data in it worked up 20 years ago.
I would NOT assume that IMR-4227 is a direct substitute. IMR's version is similar, so it would be a good choice for any application Hodgdon's 4227 is, but I'd work up loads from the beginning for the IMR powder.
Just a guess, but I suspect that when Hodgdon bought IMR, they decided it wasn't cost effective to make both powders.
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