It's a long time since we had all that activity about Bulgaria. This site gives details of artillery in Bulgarian service at the outbreak, with plenty of pics including some Turkish. There are a few types I've not come across before - the Schneider-Canet, for example.
"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.