Since the application is a dual inductor, that should have low leakage, and uses doubled up wires for ampacity, I figured I might as well wire them as "star quad".
TDR shows 5ns (reflection, actual length 2.5ns), and 13.85 ohms. Nice and low.
I started with about a half meter of wire, so 2.5ns is 2e8 m/s, or a velocity factor around 0.67. Not bad for generic Soldeaze insulation and crummy air gaps.
Tim