Found it!
It was from an article by Ken Kempa, a gun writer who did an article on a Sauer 101 in 9.3x62 in 2015, and also supplied a comprehensive load data sheet. He recorded loads with 286 Hornady and Partition bullets with H4198 (amongst all the other most relevant powders also.) He seems a reputable chap, and is published in one of the Barnes reloading books, and also Hawke bullets.
50 grains with the Speer 270 grain bullet for 2381fps and 48 grains with the 286's for 2190 fps.
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