The 400TE holds 260 yards of 14 lb mono..
Actually casting is probably easier with a thicker braid. Thinner ones dig in too much, although you'll probably cast a little farther with lighter line. I haven't used the Izorline braid, but you get the idea. I do a lot of non-swimbait fishing too- mostly jigs. Be careful with the casts, and avoid backlashes, and you should be fine. I personally think 50 lb test braid is too light, not because of the actual strength but due to the diameter. Matt Allen uses 80 lb Power Pro and 30 lb leader for hudds I believe. I'm running 50 lb test braid on my casting jig rod (200 size reel), and 80 lb test on my weedless hudd setup (300 size reel) currently.