Hello, and welcome to the forum.
There are online articles mentioning Nobel Vectan BA9 powder. Here are some I saw:
http://mp-pistol.com/mp-reloading/18157-reloading-vectan-ba9-powder.html
Manufacturer load data is at:
http://www.vectan.fr/UK/range-of-powders
The data on their site looks reasonably complete for 9mm Luger.
Remember that they develop these experimentally. They are not guidelines and not recipies. They are specific measured experimental results. When you vary from them in any way, you are performing your own experiment.
Never go below the minimum or above the maximum load. Use the same bullet (brand, construction, profile) that they used, and the same primer if you can obtain it.
Lugers may have individual loads that are better and more accurate than others. The best way to develop the load for your specific gun is by making a series of graduated loads using the same components for each cartridge. Work from just above the minimum load to just below the maximum load. Use a chronograph and a Ransom rest (this is a shooting rest that physically attaches the pistol to a solid base). Any testing done by hand introduces another variable that you would be better to eliminate.
A series of 10 cartridges at each experimental charge level should help you find a particularly good load for your individual Luger.
Marc
__________________

Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.