Both of the two you mentioned are classic powders for the 22-250. The 760 is very close to the famous h 380'and load data is similar. I have had good to excellent results with target as well, but right now, my all time best performer is IMR 8208 XBR. This stuff is very clean burning, FAST, and incredibly accurate. Low ES, and SD as well. I am using a 55 Berger varmint match, and they shoot groups that you wouldn't believe . CCI 200, or Fed 210 @ 2.464 OAL. Good luck, have fun.
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