Re: BDL or DBM
I think it greatly depends on what the intended use is of the rifle. Like any other tool, certian fetures make it more usefull for the specific job. Thats why you have the choice of ADL, BDL, DBM and single shot. All of them excell for their intended use. BDL, personaly being my least favorite.
ADL:
perfect for a light weight build or a big game hunting rifle. You dont need 10 shots quick, you want it light weight (most of the time) and you want simplistic function. No worries about dumping your shels on the ground or loosing a mag when walking thru the brush.
BDL,
For the guy that likes to un load faster on a rifle that should be an ADL
BDL does nothing else for you.
Single shot: When you dont need more than one round at a time, benchrest, and some long range weapons.
DBM: when extra rounds are needed in a short ammount of time or if you just like them for the conviniance of loading. For tactical competitions these will give you a edge over a guy that does not have one for speedy reloads and more rounds down range in a given time. Its not always needed, but nice to have when you do. For hunting, sometimes a shorter magazine can be a nice addition expecially in states where a un loaded firearm is a must while traveling. If you do short hunts and back to the vehicle to another spot a 3 or sometimes a 5rd mag is nice to have. When you need more OAL available than factory a DBM is a good way to go.
Down sides..Longer the magazine sometimes carrying with a sling is problematic and you can loose a mag in the field. Also add more weight to the rifle.
So, what are you building? I have found that a build for a specific task will usually exceed your expectations where as a build to do multiple tasks (hunting and competition) will have compermises somewhere.
Choises are good, and so are multiple tools