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Will shyt, I went and bought the Hornady 10th edition because it said it listed new powders including IMR 7977.
On the IMR 7977 container it lists the 280AI as being a suitable cartridge for this powder.
10th edition doesn't even list it with their 280AI load data.
Hawk-i..........A good rule of thumb for any AI case is to start at the upper end of load data for the original case and work up. Most AI cases will max out about 5-7% over book max for the parent cartridge.
My Hogdon book only lists 150 gr. BAR TSX with IMR7977 59.6 start-63.5 max and max load is compressed
150 gr. SFT SCIR with IMR7977 58.8 start-62.2 max compressed