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I pulled up my faithful Load From a Disk software, and that round is even listed in it (as the 22 Jet Ackley Imp).
For the Hornady 50 SP bullet, it recommends 15.5 grains of H4198 for a tad more than 2700 fps. (their listed "optimal" load.) They go up to 17.4 grains for 3050 fps as max safe load.
Other recommended powders are VVN 120, AA2015 and two hard-to-find ones: Norma 200 and AA2207.
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