Am shivering, Flintlock:
That's a 1960's -1970's load. You ARE experienced!
I used 4759 for 10% of the charge in the mid 70's. NO MORE THAN THAT!
It increased muzzle velocity about 150fps over straight black. Well before that, in the late 50's it was 3gr Red Dot dipped with a 22 short case glued to a popsicle stick in the bottom of the case, followed by 3F DuPont. The smokeless cut fouling. Slim Ackerman's trick, first used in cap and ball replica revolvers, I want to recall.
People began to reverse such load proportions, using mostly smokeless and a smidge of black. Have seen hunters use straight charges of smokeless. Was called to the local morgue to explain the hole between one corpse's eyes and the breechplug in his brain. Nasty pressures!
Currently use RMC brass, lead-dip annealed at 750 degrees for five seconds EACH reloading, 35-3F Swiss, an Accurate #51-320S bullet sized .0015" over groove OD in 18Bhn alloy and Win LRP with SPG lube in a rifle. SPG or Dewald's MCM lubes are fine with large lube groove in bullet. No wad. Decent accuracy.
Hopefully, Two Flints will chime-in with something thrilling on your serial number.
All the best,
El Supremo/Kevin Tinny