I’ve recently acquired a 3 weight fly rod for fishing small streams for trout and panfish. I’m also considering using it to fish some larger streams/rivers where I typically use a 6wt with either a sinking line or sink tip. Does anybody have any opinions one way or another on using a sinking line for my 3 weight to fish this type of water?? I enjoy fishing my 3wt alot more than my 6 wt and was wondering if I can get away with it. Thanks for any and all advice!!
I occasionally use an Airflo sinking leader – called polyleaders, I think – but on a 5-weight. You might consider trying those – easier to change and cheaper. They work pretty well for what I use them for.
I use and like a Teeny Mini-Tip flyline. It has a 5ft fast sinking tip and comes in a 3wt. I use a 4wt on my 3 and 4wt rods.
We have a WF4F/S III that gets tossed a bit on the 3wt. It used to do us a grand job targeting some of the cutts in some of the “sink ponds” between Warden and Othello.
The same line and rod did well on some spent steelhead on Alder Creek for which one needs to get down in moving water.
We pulled the boat over a stingray three times that was “incidentally” hooked while targeting halibut with this rod and a shooting head system.
We would just say to “go for it”. It seems the rod should have capability beyond what you are asking of it…so far. 
Use a heavy enough tippet so’s you can pull’em in, use your rod properly, and the fish will do fine. Again …
…lee s.