Yes it casts just fine but if you are truly punching then you are not casting far at all. I choose line size based on the rod specs, the amount of grass/cover, the size of weight/bait and the size of fish I am expecting.
centex, are you just coincidentally using the word "punching" because you want to have line strong enough to fish where there is hydrilla, or because you are going to be using the "punching" technique?
"Punching" is a specialty technique done with a very heavy/stiff rod that is really a derivative of flipping: there are no overhand casts with the rod, so the line diameter doesn't come into play like it would for traditional casting of a texas rigged worm for instance. The answers you are getting are for this technique because of the use of "punching".
My favorite braided line is the Super Slick. This line is very rounded so it casts further, easier. It goes through your guides very well and it doesn't make a lot of noise. This line is also super strong and very impact resistant. It's the best braided line on the market if you ask me.
"If people concentrated on the really important things in life, there'd be a shortage of fishing poles." - Doug Larson
I like Super Slick 8 also. Since it is woven with 8 fibers instead of 4, it doesn't flatten out and catch the wind as bad. Also agree on less guide noise. I've switched to it for all casting, still using up the regular on pitch and flip rigs.
I used the term "punching" because i really dont know what to call it. I am throwing from the bank about 25-30 yards out and the hydrilla comes all the way up to about a foot below the surface. And the hydrilla is very thick. And these fish are out in the hydrilla and i dont know wether i should use a very heavy weight and get the bait in the hydrilla or just use a very light weight and drag it on top of the hydrilla.