I thing I forgot. With the 22 Hornet the case capacity is small, so small increments in powder can make a big difference in pressure. No matter which powder you start with be careful about how much you increase the powder charge. Measure them carefully or you will get erratic results and not know why. Even a + or - .1 grain swing can make a large difference from one load to the next. Eliminate that variable from the equation. That is why I said .2 grains, normally I would make .5 grain jumps in other cartridges. Loading books are a valuable source of information, get as many as you can and consult them often.