I think the flame cutting with Lil' gun comes from when it's used in cartridges with real high pressure (for a handgun) such as the Casull. I've not noticed an issue with the .44 mag and loads at around 33 to 35 Kpsi.
N110 is another powder I have used, and found it gave up very little in velocity and was much more accurate than H110/296, but that was using longer OAL rounds in a Ruger SRH. I have not tried it with a standard OAL of 1.610".
It does burn very clean.
