I have been making shunts for years using a box of paper clips. I measured
the resistance of the full clip as .025 ohms, so part of a clip is less
resistance in a linear relationship. Larger paper clips have less
resistance. Depending upon the current drawn and the sensitivity of the
meter used, you may need to consider heat dissipation and of course consider
the insulation. I solder taps and they work fine.

Far easier than using so many feet of wire.

Colin