Re: Box Mag 30/06 build questions which Mags ?
With a dremel and some careful work you can make the 300 Win Mag mags work for a 30-06, and then you get lots of extra space in the mag to seat the bullets out long.
Remington has a magazine fed BDL I believe which holds 4 rounds of 30-06 based cartridges (270, 280, 35 Whelen, etc)
I'm working on something that will use BAR mags so I have a 20 shot bolt action rifle with a short bolt lockup rotation.