Milt;
Are you specifying 10 fps as an ultimate design number or with safety factor included.?
From FAR 25, the 10 fps figure is used to derive transport category aircraft limit loads; the condition has to be combined with all weight/cg conditions up to MLW. In addition, you have to consider 6 fps for weight/cg between MLW and MTOW. Ultimate loads will typically be 1.5 the limit loads. There is also, for the landing gear itself, the reserve energy condition of 12 fps; this is roughly equivalent to the 1.5 factor ( 12/10 squared = 1.44)