Long Action DBM

[kingzero]

Forgive me for my potential ignorance regarding this situation, but I thought the advantage to running a long action with a short action caliber was to be able to run a longer than normal OAL? If that's the case what length do you actually gain if you still have to run a short action magazine? Again apologize for the potentially stupid question just slightly confused is all.

Some people do it for a longer OAL and some do it cause it's the action they already have. I had a 7mm that I converted to 260 and have a barrel with a match chamber so my rounds are too long to fit in a standard 308 AICS mag. I currently run the factory internal mag box in my A3 but I am thinking about doing some tactical matches and a DBM setup will provide faster reloads. If I run the Alpha Type 2 mags my rounds will fit and I can use the CDI LA/308 bottom metal. However, I am considering running the standard LA DBM with the 300 mags incase I ever convert the rifle back to a LA cartridge.