iptables show just one chain

Solution 1:

I almost deleted this question. D'oh! From man iptables:

   -L, --list [chain]
          List  all rules in the selected chain.

Solution 2:

For those who might want to look at the mangle or nat tables with chains you can do so like

iptables -L mychainname -t mangle

Then it will show you that chain in the mangle table.