Yes, that's the preferred method. But...
I have my 300 copper on a linecounter reel (which won't accurately measure copper). Since i don't have a 200...i have been running my 300 down the chute deployed at varying lengths and it's been working. I re-set the counter...deployed it...and found it reads 420 with all the copper out. So, i divide 420 by 3 to (somewhat) give me an idea of where i'm at for every 100 ft. I keep the drag fairly loose...as not to damage the copper if i get a big hit.