No problem for dies, brass and bullets for the 8,15x46R
Hornady Dies:
Graf's RCBS Dies:
Huntington's Dies Brass:
Huntington's RWS Brass Bullets:
LTD Bullets 160 gr .318"
The good news is that the 8,15x46R was one of the most popular target cartridges in Europe for many years, and is still widely loaded and shot. The bad news is that it wasn't standardised for much of its history and chamber and bore dimensions varied all over the place. If your chamber happens to match the available dies it will simplify matters, but be aware it might not. Since your groove diameter appears to run near .318" and RWS brass (good stuff!) is available you ought to be at the range in no time!
Added - Quality Ctg brass available here:
MidwayUSA 
