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243 Nosler Brass Fed 210M H1000 Sierra MK 107gr Thanks in advance.

I have a 7mm Rem Mag Ruger No.1 with quite a long throat. The barrel is 26 inchs. I am trying to work up a load with Retumbo and 160gr Accubonds. I measured the OAL length using the bullet jam into the lands technique and the average came out to 3.520. Should I start at 3.505 or 3.490? Will...