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you might want to try Birchwood Casey's Barricade. It is a black colored oil wax substance that clings good but is easily removed.

If it is what I think it is, it is primer grey color and might make your guns look a little strange. The ad doesn't say how it is removed, might be difficult to clean out of a bullet mould.

I can't offer any advice on the 338 brass. I lucked into a pile of 308 Norma brass several years ago. With my factory chambered Voere 308 Norma and my friend's sportorized Mauser the case's shoulder...

My guess and it is purely specualtion, is out of concern for any possible liabilty. Most likley not wanting to devote time and resources needed to develop a load that is safe to use in the old Gew...