BL is quite the challenge for the beginner, was for me, anyway. I built a bunch of bows before ever working with the stuff and failed twice before I found good quality wood and how to treat it. You really have to be careful when you split BL because it tends to split back under itself leaving you scratching your head with that hollow noise produced by the scrapper. It also likes to propeller twist just to make things interesting and will leave you with a fret for good luck at the end if not tillered properly.
Or so they say.
BL will also vary a lot in density, within the tree, tree to tree and location. Far as ring growth, good luck with trying to figure this one out. It takes building a lot of bows to get the first hint. This could be better shown than explained here, but BL will shoot early wood growth into the late wood. If you look real close you will see it, these trees make better firewood. A well defined distinction between the two, thinner ringed, feeling like lead when you pick it up makes the best bows you've ever held. The ratio of early to late wood I'm not so worried about in Locust if the density and definition is there.
Just for the record, you will find the density increases the deeper you travel into the stave. Remove the sapwood when possible.
Hope this helps.