Both Woodleigh and Hawk make .330 bullets but there are also others in the US and around the world make bullets to suit. As far as one of the less common calibers go, the 318 WR is much better supported than the 333 Jeffery in both bullets and barrels. Brass is available from Bertram and Jamison as well as some others when there is enough demand, but can easily be made from 30-06 brass. The purists would puke at the thought of a 318 WR being built on anything than a 98 Mauser but as it is your gun, build whatever you like. It is a super cartridge.

Waidmannsheil.