I typically fish PowerPro 30# on baitcasters and PowerPro 20# on my spinning reels. Only reason for the reduction to 20# is my spinning reels are only used for topwater. 30# is a small enough diameter that it acts like a 12# mono of the reel, but is incredibly durable. This big yellow cat maxed out the Boga Grip's 30# scale like it was nothing! Fought him for half an hour with several long runs and muscled him up. The PowerPro had a little rub on it, but wasn't even close to breaking!
Capt. Craig Copeland
2013 Nautic Star 2110 Shallow Bay Boat
Nautic Star Boats Pro Staff (nauticstarboats.com)
Redneck Fish'n Jigs Pro Staff (redneckfishn.com)