Big streamer rod - 7wt vs. 8wt

Howdy all!

My current trout rod arsenal consists of four rods: 2wt, 3wt, 5wt and
6wt. I am now considering adding one more rod for heavyweight work,
for larger, possibly weighted streamers and sinking lines or sink
tips.

I'm not experienced with the line weights I should be looking at - 7wt
to 9wt; my only heavier rod is a two-handed 10/11wt. In order to
select the correct weight, I did a search for the good old table with
line weights and corresponding hook sizes:

http://www.flyanglersonline.com/begin/101/part2.html

The rule of thumb read from the table says that a 7wt should handle a
#4 fly, while an 8wt can handle a size 1/0 fly.

I understand that this is just a rough guide, but I was still somewhat
surprised about this large difference between the 7wt and the
8wt. According to this table, an 8wt would most probably do the job
for me, while a 7wt wouldn't - some of the bleak imitations we use are
pretty big. But my question is: do you agree with the rough size
ranges in the table?

--
Jarmo Hurri

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