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However, what you have to remember is that there will come a point and time when the fly will overpower the fly line and rod. A 5 weight rod and line can only handle a certain weight of fly before it fails to load properly and your cast will disintegrate rapidly. Then you have to go to a heavier rod and line.
Absolutely true. Even though I've cast some bead head woolie buggers in the size 6 range and a couple times have cast clouser minnows with my 7'6" 3 weight, it was not pretty. I would more call it a lob than a loop.