[ QUOTE ]
I find it strange that there´s no 338 LM data in Vihtavuori online manual, I wanted to guide you there.
I have only used N165 with my 338LM loads. You will probably get better advice but what I did now was a little powder change in "Quick Load" -program. I have previously used 250 Woodleighs / 96 grains N165 with a Sako TRG-S . Now QL gave me 100 grains to get a medium pressure load with N170.
I would personally start around 95 grains N170 / 250 SMK at first with a new rifle and everything unknown. Depending on your barrel length, everything may or may not burn when using N170.
EDIT: Sorry I missed the barrel info. N170 looks a little too slow according to QL. But it´s just a program... you will get a nice muzzle flash for sure.
Maybe try N165 or N560?
[/ QUOTE ]
Some loads, including the published by Vihtavuori Oy