way way to thin if you ask me
the walls surrounding the chamber should equal the chamber diameter as a minimum
ok, now many will say that its not neccesary
yeah maybe not , but do you want to be safe or sorry ??
someone maybe will load it with smokeless powder in the future , you never know .
your grandson or grand grandson maybe will blow up both himself and his family
the decission is yours
I can only give you recomendations