Forget the braided steel fishing leader. I found this stuff on a youtube video and the guy wasn't kidding. This stuff is unbelievable.
https://www.ebay.com/itm/ROTARY-PART-10068-VORTEX-TRIMMER-LINE-SMALL-SPOOL-095-x-230-BLACK/283229616451?epid=8012510663&hash=item41f1ccf943:g:5dwAAOSwzqtcD9f0
It is hard to find. Lowes doesn't sell it. Because if you bought a spool of this stuff at Lowes, you wouldn't be back for about 10 years. It is at least three times better than the orange stuff they sell at Lowes.
I call it Copperhead, but you have to look it up under Rotary Vortex Professional .095 70.1m. That is, more than 70 meters of string. Gonna last a long time. Hard to find on Amazon I could only find a huge spool that cost $47. I don't need that much line.
I don't know why that link won't come up but it is on ebay for $17.50