Sav,
I did a little nosing around and see from the ADI website that this new powder is
similar to Vit. 24N41, Re-25 and Retumbo.
Some loads:
http://www.hodgdon.com/data/rifle/3878wea.phphttp://pub.alxnet.com/guestbook?id=1148969http://www.reloadbench.com/cartridges/w338378kt.htmlhttp://www.accuratereloading.com/338378kt.htmlhttp://www.real-guns.com/archives/remwea.htm(This is the 1st of 4 articles that has data for the 338-378)
http://www.reloadersnest.com/frontpage.asp?CaliberID=143Without direct data for your ADI powder, you will have to do a little interpolation. That's why I included the Retumbo loads from Hodgdon. Just do what always gets suggested and start a bit low and work up slowly.
My other suggestion would be to contact ADI and ask them about suggested starting data. If they are like any of the other powder manufacturers, they will bend over backwards to lend a hand.
Regards.