Thanks Ted.
If the 12g Poudre J1 was 16.6 grains/dram the 54 grain load would be 3 1/4 Dr. Eq. and 58.6 grain load 3 1/2 Dr. Eq.

BUT Poudre J was semi-smokeless and may require more grains for Dram Equivalence, with pressures lower than Bulk Smokeless