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Twist for 18.5" 308?

I`m going to build a 308 with 18.5" barrel. That way it will be around 20" at end of brake. I am going to shoot either 155gr Bergers or 155gr Lapua Scenar bullets. Since my velocity will be on slow side, I was wondering what twist to go with? After doing some research but nothing really found, I believe 12 twist since my velocity will be close to that of a 300 Savage and thats the twist that cartridge has. Any help will be appreciated.
 

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