In another thread, Davy recommended the use of P-Line Halo Fluorocarbon as a 10 times lower cost alternative to tippet monofilaments marketed to fly-fishermen. Here is the conversion chart. If you use this product, please let us know what you think. By the way, based on experience, I suspect the quoted breaking strengths are actually much greater.

Pound Test Diameter (in.) Diameter (mm) Tippet Size
20 0.016 0.41 -
17 0.015 0.38 -
15 0.014 0.36 -
12 0.0116 0.29 -
10 0.011 0.28 0X
8 0.01 0.254 1X
6 0.008 0.20 3X
4 0.007 0.18 4X
2 0.004 0.10 7X