Hey guys! I've got a 6 bra, in a magpul pro 700 fxt chassis, trying to kill paper at 600- 1000 yards. I'm using a BE front rest, but I really need a rear rest. I'm currently using a couple of bags stacked on top of each other. I'm going to order a rear bag next week, and I'm currently leaning towards protektor (maybe 13 a or b?) Im just not sure what bag is the right choice for my rifle. Any help would be appreciated