Today, Bamboo CI can do snapshot deploys to /opt/ci.repository.codehaus.org/ which is accessable through http://ci.repository.codehaus.org/. As of
HAUS-2066, Nexus proxies this repo and it is included in the snapshot repo group.
However, a better solution would be for Bamboo CI to do snapshot deploys directly to Nexus. The problem though is how to do auth for those deploys.