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RUAG 338lm brass

I do not know about Ruag brass but I do know that there are some shellholders thar do not fit Lapua brass. Redding shell holders fit, but RCBS did not fit my 338 Lapua brass.

You must have the wrong one of the two RCBS ones then, because I have 200 rounds of Lapua Brass that fit quite nicely in my shell holder RCBS#14, not specifically listed just for 338LM like the other one. At least you do have a shell holder that fits them though.
I never tried the #43(?), the one that is meant to be for 338LM.