Bad Idea!!! Do not take a risk. OPT can not be used solely with a purpose to re-enter USA. They will send you back. However, if you are already enrolled with any college for future study after the completeion of OPT, then with Valid I-20 you can apply for entry visa. But Mind you, You are only eligible to re-apply for F1, but there is no gurantee that you will be granted. So, take my suggestion and do not travel outside USA until your staus changes from OPT to other.