I think they discontinued IMR4227 when Hodgdon bought them out.
My dealer told me that H-4227 was no longer being produced and when current supplies are gone it's history. Bet someone knows the answer...........
BTW....I have been using IMR-4227 in my longpipe .460 S&W mag with 240 and 300 grain XTP MAG bullets and have found it to be very accurate and not as temperature sensitive as H110/W296.
gendoc ......is that a TC Katahdin barrel? My oldest son had one and we never could find a good load for it, but them we were trying to use a 300 grain bullet. I'd be interested in what you find.