I'm looking at a little older (than the current one) manual,, burn rate chart. Mine lists Unique,, then a little later,,(slower) HS-6,,, and a few powder AFTER HS-6,, Win WSF. But it's still faster than Longshot,,,!
Studying loading charts,, I found a few calibers that show data. .41 AE, 44-40. I only looked in the manual I have at my desk. But to be sure,, I'd contact Winchester about load data for your caliber(s) of choice. See what they say.