I started using Lil'Gun back when it came out in the mid '90's. 1st for heavy magnums, but found out, just like you did that it works well reduced. Unlike some of the other slow burners like H110,296 and AA #9, which are dangerous to reduce.
Interesting is that Lil'gun was the powder used to develop the .17 HMR and CCI Velocitors. Good velocity at lower pressures. A little bit faster than your 4227 and SR4759.
I think you are in the correct burning rate range never the less.
