O.A.L. of 6.5x47 and 260REM with 140 Bergers

[dwm]

Anyone know the optimal overall length of the 6.5x47 and 260REM when loaded with the 140 Bergers?

(assuming the barrel was throated to match optimal seating depth)

I'm trying to figure out how long a magazine box would be needed.

Thanks,

Doug