Irish,
I am sorry I did not answer your question, the next time I checked the Campfire this subject had dropped off the listing. I did a search for the 30 & 338-378 subject and found your last post. RCBS is your best bet for loading the larger Weatherby cases. I use the Supreme press that gives you more room to load the 30-378 to the .460. It makes loading the .300 H&H length cases easier to work with. The cost of the 30-378 and for that matter all the cases bases on the .378 cases are all the same price about $2 per case. That is about the same cost as the .300 and .338 Lapua. I don't think you are going to find a bargin unless you find a gunshop going out of business.
Good Shooting!
Marcus.