760 is a brilliant performer in all 3 of the factory WSSMs. You _might_ get good to great results out of Supreme 780, too, if you shoot the heavies. I don't think I'd try 780 with anything lighter than about a 60 - 69, though.

I traded away my 223 WSSM barrel, so don't have load info/data any more. Still run 760 in my 25WSSM Browning. Re-17 also really screams in the WSSMs, but I'd say the majority of us get somewhat better grouping with 760. 4350 is another good choice.