In a 23 Oct 2017 article at Cosmos magazine, Cathal O'Connell reports that
researchers at CERN have made the most precise measurements to date
of the magnetic moment of an anti-proton.
The result - it appears to be identical to that of a proton.
So if antimatter didn't manage to annihilate matter at the Big Bang, it wasn't
because protons and anti-protons had different magnetic moments.
The work is also reported in an article in Nature :-
https://www.nature.com/nature/journa...ture24048.html
Cosmos article here :-
https://cosmosmagazine.com/physics/u...cists-conclude