I wouldn't necessarily trust me either, or the Lyman manual I am looking at that gives relative burn rate.

But let me be very clear. Lyman's relative burn rate list shows powders from fastest to slowest and Alliant's Unique comes in at #24. Ramshot Silhouette @ #29 and Hodgdon's Longshot at #39.

I would guess that if you are married to Unique, you should take a look at the data for Ramshot Silhouette and take a wildass guess from there.

If you think you are trustworthy.

"The number one problem with America is, a whole lot of people need shot, and nobody is shooting them."
-Master Chief Hershel Davis