The greater the mass the more energy it would take to raise the temperature of that body.
Heat capacity of a piece of a metal is FOR A GIVEN MASS of that piece.
Heat capacity of a 100g piece of a metal is different from heat capacity of a 50g piece of the metal, each piece has its own heat capacity, which is characteristic to this piece only (and to all pieces that have exactly the same mass).
Heat capacity of a calorimeter is sum of heat capacities of all elements - they may differ in specific capacity, but each has given, constant mass, so its heat capacity is constant.
Difference between specific heat capacity and heat capacity is identical to difference between concentration and amount of substance - one is intensive, other extensive property.