I tried shipping a 12" acro colony one time. The package ended up weighing like 70lbs or so. Shipping was like $160. Airbourne Express dropped the box or something and the coral died. Airbourne denied my claim (several times) and I immediately refunded the purchaser all his money. So, in the end, I was out a large, beautiful coral colony.
I wouldn't recommend shipping the colony unless you are ready to just toss the whole colony. Because if it doesn't make it, you WILL NOT be reimbursed any money. I also paid extra for full insurance on it and the claim was still denied!!!
Dennis