I found this picture of a barn owl egg ~ looks similar to yours! The The Avian Reconditioning Center in Florida actually hatched it in an incubator. I'm not sure of the legalities of hatching an owl on your own ~ it probably is not legal to do it without permits.
http://www.adoptabird.org/babybarn.html

http://www.adoptabird.org/babybarn.html
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