[quote=ImportantNobody]
The field is in the shell, silly.
[/quote]

[IMG]http://i1.kym-cdn.com/entries/icons/original/000/004/128/BRILLIANT_.jpg[/IMG]

That said, I would still say that a 3 ounce egg could likely only contain around 15 to 20kg of densified antimatter. This is of course due to the maximum power capable of being contained within the eggshell field generator. Still, an explosion of 300 to 425mt is very significant.