doubts about DTA SRS 338

[hunterbeto]

<span style="font-weight: bold">Dear friends,

I need a help on a DTA SRS 338, which the twist of the barrel of the rifle in 338?

I put a scope S & B 5-25x56 and would like to use badger rings, which measure ring I buy? Mediun high, high, ultra high?

what is the best bullet weight for this gun 300 or 250? shots will be over 1000 yards of up to 1600 yards.

thank you very much

BETO

excuse my bad English</span>