Ok, I am going to buy a completely new set up including ruck and body armor. Recommendations..? Must be able to carry ammo for a .45 ACP, .50 Beowulf, and a .50 BMG (which I will assume will have to be in a detacheable assault pack) Probably won't need a load bearing vest if my body armor can hold the modular pouches. I've been looking on lightfighter.com...but, what are your recommendations?
I would go with an Interceptor with MOLLE webbing shell. Add a few pouches from TT for your pistol.
Some things I don't know is the dementions of the Beowulf and whatever your .50BMG magazines are, but if they will fit into an AR15 pouch, great. Otherwise, get TT to make you some custom pouches.
Also look at a Camelbak system with PALS/MOLLE webbing all over the outside for further expansion if needed later.
You may want to look into a larger pack if it is going to be used as a "snail"* pack rather than a patrol pack.
* Snails have their house on their back. So something that you will be living out of for an indefinite period of time.