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I have no problem finding 243 data I have a old Hornady book along with an old Speer and a new Speer and a New Barnes and a really old one that is paper back and doesn't even have a cover, it rounds all the velocities up the nearest 100th. The old Hornady manual that I have only has IMR powders in it. I have R19 data from Speer and Barnes but I know it will be slightly different with the 100gr Interlock BT by Hornady. The BC on the bullet is different, this would make a slight difference. Yes I'm being picky, I just wanted to know what it said about it.
Probable true, a buddy of mine has a 243 that he is shooting the 100 gr. Speer BT bullet at 3200fps Old reloading book, compressed load.