Graffs is out of the Serbian Boxer-primed brass right now, but they've had it the cheapest:
http://www.grafs.com/metallic/776
Wolf imports some cartridges made up with this Boxer brass, as well as some steel case stuff, so if you are buying wolf with the intention of reloading, make sure you are buying the stuff in brass cases.
Lapua brass is out there and is excellent, and very expensive Norma.
Groove diameters vary a lot on all but the Finnish made ones, so if you are going to use cast you will need to measure your goove diameter. I typically use a cast Lead rifle bullet about .002" larger than my groove diameter. The design of your bullet must be compatible with the rifling and throat. I like bullets like the 314299 from Lyman. You will have to bell your case mouths a bit to seat fragile Lead bullets.
I like the Sierra 180gr jacketed bullets, and any variety of 4350 powder for jacketed bullet loads.
Before you invest in casting materials, it might be best if you measured your groove diameter and bought some cast bullets of several designs that fit your barrel groove diameter. Decide whether you are shooting for maximum economy, or something that nears jacketed bullet performance, or something in-between.
Most people shooting cast bullets will use fast pistol powders with them. Beware of double charges of powder. I will charge a case with powder and immediately seat a bullet on it, and have never had a problem.