Re: Indoor practice
I wouldn't worry about the line so much- condiotuion it well and keep it clean and you should be good.
One thing that would probably help a lot is to scatter some frisbees or the like around at various distances. Cast at on until you can drop the little tuft of yarn (fake fly) onto the frisbee, then turn a little bit and cast at the next frisbee. When the frisbees get to be easy target drop down to something smaller. It pretty much covers everything, accuracy, distance and ranging.
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