According to some data that I have the WC 7/8/9 was supposed to weigh 554 grains and the 15 foot tip two was 160 grains. So the belly plus tip should weigh about 394 grains. The WC 8/9/10 weighs 589 grains and the tip 2 weighs 170. So, removing tip two would give about 419 grains.
I've found my lines, and their component parts, to weigh slightly more or less than what is listed on that site, but generally pretty close. Many times well within the stated margin of error of plus or minus 5 percent; although, not always. Definitely a good overview and general resource for figuring out line weights, though.
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