I've never used 5744 myself - however, I have a pound a friend gave me to try out.

I told my bro I was going to try it in the .50/95 and he said that was a waist, I should be using it for a duplex load with black.

Prior experimenting in the .45 3 1/4| and my .50/70 showed me that 10 to 15gr. IMR3031 was a much better duplex 'starter' for black powder, than the normal 4759 or other fast powders.

With a 368gr. cast bullet, my 1876 gets 1,640fps with straight black powder loads of 78gr. GOEX 3F and 1,580fps with 85gr. Swiss 1 1/2F.

In bottle necked cases, the IMR Trail Boss will get pressures up to almost 30,000PSI if using jacketed bullets, according to Hodgdon's data.