WC820 is a fine powder that I use for .45 Colt loads. The 8# batch I received duplicates H110 burn rates almost exactly.
But like Leftoverdj said, be very conservative when you first start loading with it to determine the burn speed...
Yes, in fact I do have a 454... in more ways than one.
"No provision in our Constitution ought to be dearer to man than that which protects the rights of conscience against the enterprises of the civil authority" - Thomas Jefferson