Casting in a fast current....This can be tricky but is possible... you must first cast up current in order to allow your net enough time to sink before you run out of rope due to the current pulling your net down stream..... Second you must close your net before the current flattens it out and before you run out of rope...You must get a feel of the current to figure out the timing you will need to maintain ... You need to try and visualize how the current is affecting your net underneath the water... This comes with practice..... The current will be closing the spread of your net therefore it is important to familiarize your self on how your net reacts to different currents.... The size of your net will play a major factor in these situations.... Being that bigger nets are usually heavier which will help them to sink to the desired dpth quicker.... Here is where you need to read the labels on the box before purchasing the net.... The heavier the better... sinks faster..... What size mesh this will also affect the speed of the drop....I believe an 8' Super Spreader cast net weighs about 8 lb..... where as an 8' Dolphin castnet weighs about 10 lb..... This may seem like a little difference, but 2 lb. can make a major difference in your catch......Now when it comes to what size mesh to choose... 3/8" is all around size... Any smaller and you will be catching shad to small for a brem hook.... Any bigger and you will lose a lot of 3" to 4" shad.... If you want only 6" bait and bigger then you can go up to 1/2 " mesh........ The choice is yours, my advice is to go with 3/8" and you will be good or almost anything and it sinks with hardly any restriction.....