Been flyfishing for 30 yrs and my go too rods are in 4 weight, I've caught tiny brook trout, to large bull trout on them, and they suit me fine! Any of the weights between 3 to 6 will work for southern Alberta! You may find that it's a bit harder to set the hook with a 3 weight, and that if your catching smaller fish with a 6 weight, your missing out on a good fight! If you plan on doing a lot of bull trout fishing, you may consider a 5 weight! If I'm dry fly fishing ONLY, I like my 3 weight rods, it's rare that a bull trout rises for dry flies during the day! I would say that if you can get your hands on that sage one for a good price, do it, you will not regret it!
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