Pistol Powder is good for the 124 jacketed loads but Accurate Arms #7 will get you higher velocities and is a bit cleaner burning and easier more consistent metering in a Dillon powder measure. Charge weights run from 7.0grs to 8.0grs for 1200fps. AA#5 is also a god choice if you have that with charge weights from 5.4grt to 6.4grs for a bit over 1230fps at max loads.
Jim
Miossi Gun Works LLC
702 Park Dr
Monticello, IA 52310