Re: 338 Edge Repeater magazine help...
I'll look through my photobucket account when I get home tonight.
The repeater I did was on a stagger feed action using a blind mag stock.
I didn't do much work to the feed ramp. Only enough to eliminate the slot for the stagger feed magazine.
Most of the work was done to the rear of the magazine opening. I just opened it up so it was nearly flush with the bolt nose.
It could clear a little over 3.9", but remember it was a blind mag.
Since you are looking for a DBM, I'm having a hard time picturing how the trigger guard, rear action screw, mag well, and mag release is all going to occupy the same space while allowing Edge length COAL.