You mention "target loads". Depending on what you mean by that, you may want to stick with one headstamp on your brass, to make it as consistent as possible, but that doesn't preclude using (well-inspected) range brass.
Go to the Hodgdon website, reloading section, 9mm Luger, 115gr bullets, Winchester 231 powder. You'll discover that 3.5 grains is below the recommended starting charge of 4.7 grains.
With some things in life, you either KNOW what you're doing, or you shouldn't be messing with it. Herpetologists, for example! Reloading is one of those things. If you have questions, that's fine, but when you start putting loads together, have at least two verified sources for your data (not a buddy or forum reply). Good luck and let us know how ya do.