pocket nukes

A thought:

Can smaller warhead be achieved by using a gravitic field (one shot) to
compress rather than explosives and thus achieving fusion/fission in a
smaller package? (assumption: grav tech is smaller than explosives....)

If this is the case, the atomic bazooka of ST becomes reasonable. 

To do this justice in SG2, you'd need to define a primary, secondary and
tertiary blast radius. Anything inside of primary is vaporized.
Secondary, a good roll against armour. Tertiary, some lesser roll. We
ignore radiation as a factor within the context of the scenario and let
the doctors worry about it later.