We use 177 as it's better for certainty of shot placement but it is the lightest calibre available. 25 years back I picked up a 0.25 calibre Daystate LR90 and was amazed at the knock down power. If it wasn't for the problem of needing precise range estimation that would be my chosen calibre. If you have 25 cal and 54 fpe, you have everything I'd want.