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Scope base for 338LM, 20* or 40*

Derek01

Private
Full Member
Minuteman
May 2, 2011
58
3
64
WV
Don't which base I should use on a 338LM, a 20* or 40*. I have a NF with 120 MOA total, 60 up/ 60 down. I think the effective range is about 2000 yds which would be about 80 MOA, correct me if I'm wrong. That would max me out with the 20* base. Do I want or need the extra MOA's of the 40*, just in case?
Thanks