Something else that is often misunderstood is the weight of framing hammers...
A standard claw hammer usually weight 16oz....typical framing hammers usually weigh 20, 22, 28 ounces...
An experienced carpenter can sink the same nails with the same amount of blows whether it's a 16oz. or a 28oz hammer...the reason framing hammers come in heavier weights is for moving "things"...it's much easier to move sill plates, heavy framing member, trusses, timber etc. with a heavier hammer...
original "framing" hammers often came with extended handles and hatchet blades rather than a claw...