BO: I never new they made the eclipse in a 54 cal,I own a 50 cal eclipse and it is a tack driver.My only dis-like is the plastic stock,never could get use to it the gun just sit in the safe.
I would read there manual as far poewder loads ,seem a guy on anither forum just blew up a eclipse using 100 grains of triple 777 powder.
I found that my eclipse would favor pyrodex select powder and precision sabot QT'S 40 in 235 grain good luck with the gun