spartan helmet

I am trying to make a spartan helmet like the ones in 300. Although i am having problems on something that i think should be easy.

The dome shape kind of thing on the back of the head. I did not make my helmet exactly a circle so i am unable to make that shape while filling all the space and keeping it a circle. If someone could tell me how i can do this, that would be awesome.

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if your talking about making a spher dome then put a UVsphere and cut it in half then continue adding on it !

hope it helps

if not explain more in detail what you want to do !

Salutations