If you have about 34 strange coins, it's an instant level up for a faction. It's more like 33.3 repeating but there's no such thing as a third of a coin (ba dum Ts). 34 times 3 for how much heavy ammo you get, which should be just over a hundred. 100 heavy ammo synthesis is a free level up, because you get 25 reputation each synthesis, and it takes 2500 reputation for a faction level up. So, if you have an abundance of strange coins, go level up your faction! Get that God rolled hung jury, or that chroma set of Titan armor in the new monarchy (that fur is pretty sexy), or a god rolled Villainy from the FWC