Looking at AC 43.13-1B, it seems the only gauge of safety wire for turnbuckles is .040 (page 7-45), regardless of how it's done (single wrap, double wrap) or type (brass, stainless, etc.).

I realize that in the E-AB world we can look a the word "guide" and use our own judgement, but at work we're seeing a lot of aircraft (both certified and Experimental) with .032 double wrapped on turnbuckles, and I'm wondering if we're missing something here.

https://www.faa.gov/documentLibrary/...-1B_w-chg1.pdf