going off of what is in my sierra book, the general issue 54R load is a 148 grain bullet travelling roughly 2600 FPS.
conversely the 7.7 jap load was a 184 grain projectile travelling roughly 2400 FPS.
I can't find any 1 bullet style in those two exact weights but with a 150gr sierra pro hunter at 2600 FPS the muzzle energy is 2250FTLBS.
the same bullet in 180gr at 2400FPS is just over 2300FTLBS so even giving the 54R a handicap, 7.7 still comes out on top for energy.
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ignore my complete lack of capitalization. I still have no problem correcting your grammar.
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