Re: 338 Lapua barrel, 10 or 9.35 twist
I ran into the same thing, I'm ordering two 338 barrels and for a 338 Norma the recommendation was a 9.3 and the 338 RUM it was 1-10. I didn't ask why I just tell the barrel guys what I'm doing and let them do their magic.
I suspect that it may have to do more with extreme long range accuracy, well beyond normal LRH even.
"Pain is weakness leaving your body"